diff --git a/src/main/java/gregtech/api/metatileentity/BaseMetaPipeEntity.java b/src/main/java/gregtech/api/metatileentity/BaseMetaPipeEntity.java
index 30a1561f203..0ef1d196e93 100644
--- a/src/main/java/gregtech/api/metatileentity/BaseMetaPipeEntity.java
+++ b/src/main/java/gregtech/api/metatileentity/BaseMetaPipeEntity.java
@@ -960,7 +960,7 @@ public boolean onRightclick(EntityPlayer aPlayer, ForgeDirection side, float aX,
                             && mMetaTileEntity.allowCoverOnSide(coverSide, new GTItemStack(tCurrentItem))) {
 
                             setCoverItemAtSide(coverSide, tCurrentItem);
-                            coverBehavior.onPlayerAttach(aPlayer, tCurrentItem, this, side);
+                            coverBehavior.onPlayerAttach(aPlayer, tCurrentItem, this, coverSide);
 
                             mMetaTileEntity.markDirty();
                             if (!aPlayer.capabilities.isCreativeMode) tCurrentItem.stackSize--;