diff --git a/src/main/java/gregtech/common/items/GT_VolumetricFlask.java b/src/main/java/gregtech/common/items/GT_VolumetricFlask.java
index 1062f1c163..13eb1b2c4b 100644
--- a/src/main/java/gregtech/common/items/GT_VolumetricFlask.java
+++ b/src/main/java/gregtech/common/items/GT_VolumetricFlask.java
@@ -122,6 +122,7 @@ public int getCapacity(ItemStack stack) {
     }
 
     @Override
+    @SideOnly(Side.CLIENT)
     public void registerIcons(IIconRegister aIconRegister) {
         super.registerIcons(aIconRegister);
         iconWindow = aIconRegister.registerIcon(RES_PATH_ITEM + "gt."+unlocalFlaskName+".window");