diff --git a/src/main/kotlin/mods/betterfoliage/client/integration/ForestryIntegration.kt b/src/main/kotlin/mods/betterfoliage/client/integration/ForestryIntegration.kt
index 511e627..5e823eb 100644
--- a/src/main/kotlin/mods/betterfoliage/client/integration/ForestryIntegration.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/integration/ForestryIntegration.kt
@@ -68,6 +68,7 @@ object ForestryIntegration {
     }
 }
 
+@SideOnly(Side.CLIENT)
 object ForestryLeavesSupport : ILeafRegistry {
 
     val textureToValue = mutableMapOf<ResourceLocation, LeafInfo>()
@@ -123,6 +124,7 @@ object ForestryLeavesSupport : ILeafRegistry {
     }
 }
 
+@SideOnly(Side.CLIENT)
 object ForestryLogSupport : ModelProcessor<List<String>, IColumnTextureInfo>, IColumnRegistry {
 
     override var stateToKey = mutableMapOf<IBlockState, List<String>>()
diff --git a/src/main/kotlin/mods/betterfoliage/client/integration/OptifineCTM.kt b/src/main/kotlin/mods/betterfoliage/client/integration/OptifineCTM.kt
index c3e815f..fadf4e3 100644
--- a/src/main/kotlin/mods/betterfoliage/client/integration/OptifineCTM.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/integration/OptifineCTM.kt
@@ -78,6 +78,7 @@ object OptifineCTM {
     }
 }
 
+@SideOnly(Side.CLIENT)
 class OptifineRenderEnv {
     val wrapped: Any = Refs.RenderEnv.element!!.getDeclaredConstructor(
         Refs.IBlockAccess.element, Refs.IBlockState.element, Refs.BlockPos.element
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/AbstractRenderColumn.kt b/src/main/kotlin/mods/betterfoliage/client/render/AbstractRenderColumn.kt
index 247ec24..b6e049f 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/AbstractRenderColumn.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/AbstractRenderColumn.kt
@@ -14,7 +14,10 @@ import net.minecraft.client.renderer.texture.TextureAtlasSprite
 import net.minecraft.util.BlockRenderLayer
 import net.minecraft.util.EnumFacing
 import net.minecraft.util.EnumFacing.*
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 
+@SideOnly(Side.CLIENT)
 interface IColumnTextureInfo {
     val axis: Axis?
     val top: (ShadingContext, Int, Quad)->TextureAtlasSprite?
@@ -22,10 +25,12 @@ interface IColumnTextureInfo {
     val side: (ShadingContext, Int, Quad)->TextureAtlasSprite?
 }
 
+@SideOnly(Side.CLIENT)
 interface IColumnRegistry {
     operator fun get(state: IBlockState): IColumnTextureInfo?
 }
 
+@SideOnly(Side.CLIENT)
 data class StaticColumnInfo(override val axis: Axis?,
                             val topTexture: TextureAtlasSprite,
                             val bottomTexture: TextureAtlasSprite,
@@ -50,6 +55,7 @@ const val NW = 2
 /** Index of SOUTH-WEST quadrant. */
 const val SW = 3
 
+@SideOnly(Side.CLIENT)
 @Suppress("NOTHING_TO_INLINE")
 abstract class AbstractRenderColumn(modId: String) : AbstractBlockRenderingHandler(modId) {
 
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/EntityFallingLeavesFX.kt b/src/main/kotlin/mods/betterfoliage/client/render/EntityFallingLeavesFX.kt
index c6b65c0..a75602c 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/EntityFallingLeavesFX.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/EntityFallingLeavesFX.kt
@@ -25,6 +25,7 @@ import org.lwjgl.opengl.GL11
 import java.lang.Math.*
 import java.util.*
 
+@SideOnly(Side.CLIENT)
 class EntityFallingLeavesFX(world: World, pos: BlockPos) :
 AbstractEntityFX(world, pos.x.toDouble() + 0.5, pos.y.toDouble(), pos.z.toDouble() + 0.5) {
 
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/EntityRisingSoulFX.kt b/src/main/kotlin/mods/betterfoliage/client/render/EntityRisingSoulFX.kt
index c7e14dc..fe4fcaa 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/EntityRisingSoulFX.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/EntityRisingSoulFX.kt
@@ -16,6 +16,7 @@ import net.minecraftforge.fml.relauncher.SideOnly
 import org.apache.logging.log4j.Level.INFO
 import java.util.*
 
+@SideOnly(Side.CLIENT)
 class EntityRisingSoulFX(world: World, pos: BlockPos) :
 AbstractEntityFX(world, pos.x.toDouble() + 0.5, pos.y.toDouble() + 1.0, pos.z.toDouble() + 0.5) {
 
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/RenderAlgae.kt b/src/main/kotlin/mods/betterfoliage/client/render/RenderAlgae.kt
index ce9c3d6..f46f71d 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/RenderAlgae.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/RenderAlgae.kt
@@ -11,8 +11,11 @@ import net.minecraft.block.material.Material
 import net.minecraft.client.renderer.BlockRendererDispatcher
 import net.minecraft.client.renderer.VertexBuffer
 import net.minecraft.util.BlockRenderLayer
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 import org.apache.logging.log4j.Level.INFO
 
+@SideOnly(Side.CLIENT)
 class RenderAlgae : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
 
     val noise = simplexNoise()
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/RenderCactus.kt b/src/main/kotlin/mods/betterfoliage/client/render/RenderCactus.kt
index 790a083..9d773e5 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/RenderCactus.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/RenderCactus.kt
@@ -20,8 +20,11 @@ import net.minecraft.client.renderer.texture.TextureMap
 import net.minecraft.util.BlockRenderLayer
 import net.minecraft.util.EnumFacing.*
 import net.minecraftforge.common.MinecraftForge
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 import org.apache.logging.log4j.Level
 
+@SideOnly(Side.CLIENT)
 class RenderCactus : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
 
     val cactusStemRadius = 0.4375
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/RenderConnectedGrass.kt b/src/main/kotlin/mods/betterfoliage/client/render/RenderConnectedGrass.kt
index b755c67..1bfe972 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/RenderConnectedGrass.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/RenderConnectedGrass.kt
@@ -9,7 +9,10 @@ import mods.octarinecore.common.Int3
 import net.minecraft.client.renderer.BlockRendererDispatcher
 import net.minecraft.client.renderer.VertexBuffer
 import net.minecraft.util.BlockRenderLayer
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 
+@SideOnly(Side.CLIENT)
 class RenderConnectedGrass : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
     override fun isEligible(ctx: BlockContext) =
         Config.enabled && Config.connectedGrass.enabled &&
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/RenderConnectedGrassLog.kt b/src/main/kotlin/mods/betterfoliage/client/render/RenderConnectedGrassLog.kt
index 6816323..9b302a2 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/RenderConnectedGrassLog.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/RenderConnectedGrassLog.kt
@@ -11,7 +11,10 @@ import net.minecraft.client.renderer.BlockRendererDispatcher
 import net.minecraft.client.renderer.VertexBuffer
 import net.minecraft.util.BlockRenderLayer
 import net.minecraft.util.EnumFacing.*
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 
+@SideOnly(Side.CLIENT)
 class RenderConnectedGrassLog : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
 
     val grassCheckDirs = listOf(EAST, WEST, NORTH, SOUTH)
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/RenderCoral.kt b/src/main/kotlin/mods/betterfoliage/client/render/RenderCoral.kt
index b399396..43ca757 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/RenderCoral.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/RenderCoral.kt
@@ -14,8 +14,11 @@ import net.minecraft.client.renderer.VertexBuffer
 import net.minecraft.util.BlockRenderLayer
 import net.minecraft.util.EnumFacing.Axis
 import net.minecraft.util.EnumFacing.UP
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 import org.apache.logging.log4j.Level.INFO
 
+@SideOnly(Side.CLIENT)
 class RenderCoral : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
 
     val noise = simplexNoise()
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/RenderGrass.kt b/src/main/kotlin/mods/betterfoliage/client/render/RenderGrass.kt
index c2574e6..4ab7623 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/RenderGrass.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/RenderGrass.kt
@@ -15,8 +15,11 @@ import net.minecraft.client.renderer.VertexBuffer
 import net.minecraft.util.BlockRenderLayer
 import net.minecraft.util.EnumFacing.Axis
 import net.minecraft.util.EnumFacing.UP
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 import org.apache.logging.log4j.Level.INFO
 
+@SideOnly(Side.CLIENT)
 class RenderGrass : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
 
     companion object {
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/RenderLeaves.kt b/src/main/kotlin/mods/betterfoliage/client/render/RenderLeaves.kt
index b344747..cda1d7b 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/RenderLeaves.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/RenderLeaves.kt
@@ -17,9 +17,12 @@ import net.minecraft.client.renderer.VertexBuffer
 import net.minecraft.util.BlockRenderLayer
 import net.minecraft.util.EnumFacing.DOWN
 import net.minecraft.util.EnumFacing.UP
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 import java.lang.Math.cos
 import java.lang.Math.sin
 
+@SideOnly(Side.CLIENT)
 class RenderLeaves : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
 
     val leavesModel = model {
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/RenderLilypad.kt b/src/main/kotlin/mods/betterfoliage/client/render/RenderLilypad.kt
index 570d848..02c99ee 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/RenderLilypad.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/RenderLilypad.kt
@@ -12,8 +12,11 @@ import net.minecraft.client.renderer.VertexBuffer
 import net.minecraft.util.BlockRenderLayer
 import net.minecraft.util.EnumFacing.DOWN
 import net.minecraft.util.EnumFacing.UP
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 import org.apache.logging.log4j.Level
 
+@SideOnly(Side.CLIENT)
 class RenderLilypad : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
 
     val rootModel = model {
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/RenderLog.kt b/src/main/kotlin/mods/betterfoliage/client/render/RenderLog.kt
index e6781ff..ba2451e 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/RenderLog.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/RenderLog.kt
@@ -19,9 +19,12 @@ import net.minecraft.client.renderer.texture.TextureAtlasSprite
 import net.minecraft.client.renderer.texture.TextureMap
 import net.minecraft.util.EnumFacing.Axis
 import net.minecraftforge.common.MinecraftForge
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 import org.apache.logging.log4j.Level
 import org.apache.logging.log4j.Logger
 
+@SideOnly(Side.CLIENT)
 class RenderLog : AbstractRenderColumn(BetterFoliageMod.MOD_ID) {
 
     override val moveToCutout: Boolean get() = false
@@ -44,11 +47,13 @@ class RenderLog : AbstractRenderColumn(BetterFoliageMod.MOD_ID) {
 
 }
 
+@SideOnly(Side.CLIENT)
 object LogRegistry : IColumnRegistry {
     val subRegistries: MutableList<IColumnRegistry> = mutableListOf(StandardLogSupport)
     override fun get(state: IBlockState) = subRegistries.findFirst { it[state] }
 }
 
+@SideOnly(Side.CLIENT)
 object StandardLogSupport : TextureListModelProcessor<IColumnTextureInfo>, IColumnRegistry {
 
     init { MinecraftForge.EVENT_BUS.register(this) }
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/RenderMycelium.kt b/src/main/kotlin/mods/betterfoliage/client/render/RenderMycelium.kt
index 2026259..7891d22 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/RenderMycelium.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/RenderMycelium.kt
@@ -13,8 +13,11 @@ import net.minecraft.client.renderer.BlockRendererDispatcher
 import net.minecraft.client.renderer.VertexBuffer
 import net.minecraft.init.Blocks
 import net.minecraft.util.BlockRenderLayer
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 import org.apache.logging.log4j.Level.INFO
 
+@SideOnly(Side.CLIENT)
 class RenderMycelium : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
 
     val myceliumIcon = iconSet(BetterFoliageMod.LEGACY_DOMAIN, "blocks/better_mycel_%d")
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/RenderNetherrack.kt b/src/main/kotlin/mods/betterfoliage/client/render/RenderNetherrack.kt
index d71dc20..0a85bbd 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/RenderNetherrack.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/RenderNetherrack.kt
@@ -12,8 +12,11 @@ import net.minecraft.client.renderer.VertexBuffer
 import net.minecraft.init.Blocks
 import net.minecraft.util.BlockRenderLayer
 import net.minecraft.util.EnumFacing.*
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 import org.apache.logging.log4j.Level.INFO
 
+@SideOnly(Side.CLIENT)
 class RenderNetherrack : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
 
     val netherrackIcon = iconSet(BetterFoliageMod.LEGACY_DOMAIN, "blocks/better_netherrack_%d")
diff --git a/src/main/kotlin/mods/betterfoliage/client/render/RenderReeds.kt b/src/main/kotlin/mods/betterfoliage/client/render/RenderReeds.kt
index 978b9fd..9e10f8d 100644
--- a/src/main/kotlin/mods/betterfoliage/client/render/RenderReeds.kt
+++ b/src/main/kotlin/mods/betterfoliage/client/render/RenderReeds.kt
@@ -13,8 +13,11 @@ import net.minecraft.client.renderer.BlockRendererDispatcher
 import net.minecraft.client.renderer.VertexBuffer
 import net.minecraft.util.BlockRenderLayer
 import net.minecraft.util.EnumFacing.UP
+import net.minecraftforge.fml.relauncher.Side
+import net.minecraftforge.fml.relauncher.SideOnly
 import org.apache.logging.log4j.Level
 
+@SideOnly(Side.CLIENT)
 class RenderReeds : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
 
     val noise = simplexNoise()
diff --git a/src/main/kotlin/mods/octarinecore/client/render/Shading.kt b/src/main/kotlin/mods/octarinecore/client/render/Shading.kt
index a04d59f..b853e2e 100644
--- a/src/main/kotlin/mods/octarinecore/client/render/Shading.kt
+++ b/src/main/kotlin/mods/octarinecore/client/render/Shading.kt
@@ -38,7 +38,7 @@ class AoData() {
     }
 
     companion object {
-        val black = AoData();
+        val black = AoData()
     }
 }