diff --git a/src/main/java/de/ellpeck/actuallyadditions/mod/blocks/BlockCrystalCluster.java b/src/main/java/de/ellpeck/actuallyadditions/mod/blocks/BlockCrystalCluster.java
index d340f897a..b342d4428 100644
--- a/src/main/java/de/ellpeck/actuallyadditions/mod/blocks/BlockCrystalCluster.java
+++ b/src/main/java/de/ellpeck/actuallyadditions/mod/blocks/BlockCrystalCluster.java
@@ -119,6 +119,7 @@ public class BlockCrystalCluster extends BlockBase implements IColorProvidingBlo
     }
 
     @Override
+    @SideOnly(Side.CLIENT)
     public IItemColor getItemColor(){
         return new IItemColor(){
             @Override