diff --git a/src/main/java/mods/betterfoliage/client/ShadersModIntegration.java b/src/main/java/mods/betterfoliage/client/ShadersModIntegration.java
index f10b630..833eff4 100644
--- a/src/main/java/mods/betterfoliage/client/ShadersModIntegration.java
+++ b/src/main/java/mods/betterfoliage/client/ShadersModIntegration.java
@@ -2,10 +2,14 @@ package mods.betterfoliage.client;
 
 import java.lang.reflect.Field;
 
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
+
 import net.minecraft.block.Block;
 import net.minecraft.init.Blocks;
 import net.minecraft.util.ResourceLocation;
 
+@SideOnly(Side.CLIENT)
 public class ShadersModIntegration {
 
 	private static boolean hasShadersMod = false;
diff --git a/src/main/java/mods/betterfoliage/client/gui/ConfigGuiAlgae.java b/src/main/java/mods/betterfoliage/client/gui/ConfigGuiAlgae.java
index f6595a0..30be0b9 100644
--- a/src/main/java/mods/betterfoliage/client/gui/ConfigGuiAlgae.java
+++ b/src/main/java/mods/betterfoliage/client/gui/ConfigGuiAlgae.java
@@ -7,7 +7,10 @@ import net.minecraft.client.gui.GuiButton;
 import net.minecraft.client.gui.GuiScreen;
 import net.minecraft.client.resources.I18n;
 import cpw.mods.fml.client.FMLClientHandler;
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
 
+@SideOnly(Side.CLIENT)
 public class ConfigGuiAlgae extends ConfigGuiScreenBase {
 
 	public ConfigGuiAlgae(GuiScreen parent) {
diff --git a/src/main/java/mods/betterfoliage/client/gui/ConfigGuiGrass.java b/src/main/java/mods/betterfoliage/client/gui/ConfigGuiGrass.java
index 277276a..42fb544 100644
--- a/src/main/java/mods/betterfoliage/client/gui/ConfigGuiGrass.java
+++ b/src/main/java/mods/betterfoliage/client/gui/ConfigGuiGrass.java
@@ -6,7 +6,10 @@ import net.minecraft.client.gui.GuiButton;
 import net.minecraft.client.gui.GuiScreen;
 import net.minecraft.client.resources.I18n;
 import cpw.mods.fml.client.FMLClientHandler;
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
 
+@SideOnly(Side.CLIENT)
 public class ConfigGuiGrass extends ConfigGuiScreenBase {
 
 	public enum Button {CLOSE, GRASS_USE_GENERATED}
diff --git a/src/main/java/mods/betterfoliage/client/gui/ConfigGuiLeaves.java b/src/main/java/mods/betterfoliage/client/gui/ConfigGuiLeaves.java
index 0988e97..bfd5a22 100644
--- a/src/main/java/mods/betterfoliage/client/gui/ConfigGuiLeaves.java
+++ b/src/main/java/mods/betterfoliage/client/gui/ConfigGuiLeaves.java
@@ -6,7 +6,10 @@ import net.minecraft.client.gui.GuiButton;
 import net.minecraft.client.gui.GuiScreen;
 import net.minecraft.client.resources.I18n;
 import cpw.mods.fml.client.FMLClientHandler;
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
 
+@SideOnly(Side.CLIENT)
 public class ConfigGuiLeaves extends ConfigGuiScreenBase {
 
 	public enum Button {CLOSE, LEAVES_OFFSET_MODE}
diff --git a/src/main/java/mods/betterfoliage/client/gui/ConfigGuiLilypad.java b/src/main/java/mods/betterfoliage/client/gui/ConfigGuiLilypad.java
index 4670b5d..5ea61bf 100644
--- a/src/main/java/mods/betterfoliage/client/gui/ConfigGuiLilypad.java
+++ b/src/main/java/mods/betterfoliage/client/gui/ConfigGuiLilypad.java
@@ -7,7 +7,10 @@ import net.minecraft.client.gui.GuiButton;
 import net.minecraft.client.gui.GuiScreen;
 import net.minecraft.client.resources.I18n;
 import cpw.mods.fml.client.FMLClientHandler;
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
 
+@SideOnly(Side.CLIENT)
 public class ConfigGuiLilypad extends ConfigGuiScreenBase {
 
 	public ConfigGuiLilypad(GuiScreen parent) {
diff --git a/src/main/java/mods/betterfoliage/client/gui/ConfigGuiReed.java b/src/main/java/mods/betterfoliage/client/gui/ConfigGuiReed.java
index a2fb98b..283377c 100644
--- a/src/main/java/mods/betterfoliage/client/gui/ConfigGuiReed.java
+++ b/src/main/java/mods/betterfoliage/client/gui/ConfigGuiReed.java
@@ -7,7 +7,10 @@ import net.minecraft.client.gui.GuiButton;
 import net.minecraft.client.gui.GuiScreen;
 import net.minecraft.client.resources.I18n;
 import cpw.mods.fml.client.FMLClientHandler;
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
 
+@SideOnly(Side.CLIENT)
 public class ConfigGuiReed extends ConfigGuiScreenBase {
 
 	public ConfigGuiReed(GuiScreen parent) {
diff --git a/src/main/java/mods/betterfoliage/client/gui/ConfigGuiScreenBase.java b/src/main/java/mods/betterfoliage/client/gui/ConfigGuiScreenBase.java
index 4bbb197..8a8cf60 100644
--- a/src/main/java/mods/betterfoliage/client/gui/ConfigGuiScreenBase.java
+++ b/src/main/java/mods/betterfoliage/client/gui/ConfigGuiScreenBase.java
@@ -10,6 +10,10 @@ import net.minecraft.util.EnumChatFormatting;
 
 import com.google.common.collect.Lists;
 
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
+
+@SideOnly(Side.CLIENT)
 public class ConfigGuiScreenBase extends GuiScreen {
 
 	protected GuiScreen parent;
diff --git a/src/main/java/mods/betterfoliage/client/gui/widget/IOptionWidget.java b/src/main/java/mods/betterfoliage/client/gui/widget/IOptionWidget.java
index 3bb6433..44db659 100644
--- a/src/main/java/mods/betterfoliage/client/gui/widget/IOptionWidget.java
+++ b/src/main/java/mods/betterfoliage/client/gui/widget/IOptionWidget.java
@@ -2,10 +2,14 @@ package mods.betterfoliage.client.gui.widget;
 
 import java.util.List;
 
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
+
 import net.minecraft.client.gui.FontRenderer;
 import net.minecraft.client.gui.GuiButton;
 import net.minecraft.client.gui.GuiScreen;
 
+@SideOnly(Side.CLIENT)
 public interface IOptionWidget {
 
 	public void addButtons(List<GuiButton> buttonList, int xOffset, int yOffset);
diff --git a/src/main/java/mods/betterfoliage/client/resource/LeafParticleTextures.java b/src/main/java/mods/betterfoliage/client/resource/LeafParticleTextures.java
index a4c02bd..33c67e8 100644
--- a/src/main/java/mods/betterfoliage/client/resource/LeafParticleTextures.java
+++ b/src/main/java/mods/betterfoliage/client/resource/LeafParticleTextures.java
@@ -17,11 +17,14 @@ import net.minecraftforge.client.event.TextureStitchEvent;
 import com.google.common.collect.Maps;
 
 import cpw.mods.fml.common.eventhandler.SubscribeEvent;
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
 
 /** Holds the texture for the falling leaf particles, and stores average texture color values for leaf textures
  * @author octarine-noise
  *
  */
+@SideOnly(Side.CLIENT)
 public class LeafParticleTextures {
 
 	/** Icon for leaf particles */