diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_AssemblyLine.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_AssemblyLine.java
index 5e8d283d..0098d74b 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_AssemblyLine.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_AssemblyLine.java
@@ -134,6 +134,7 @@ public class GT_MetaTileEntity_AssemblyLine
             }
         }
         this.mMaxProgresstime = Math.max(1, this.mMaxProgresstime);
+        updateSlots();
         return true;
     }
 
@@ -238,4 +239,4 @@ public class GT_MetaTileEntity_AssemblyLine
     public boolean explodesOnComponentBreak(ItemStack aStack) {
         return false;
     }
-}
\ No newline at end of file
+}