diff --git a/src/main/java/gregtech/api/metatileentity/implementations/GT_MetaTileEntity_MultiBlockBase.java b/src/main/java/gregtech/api/metatileentity/implementations/GT_MetaTileEntity_MultiBlockBase.java
index a8301af4..4edb0ae5 100644
--- a/src/main/java/gregtech/api/metatileentity/implementations/GT_MetaTileEntity_MultiBlockBase.java
+++ b/src/main/java/gregtech/api/metatileentity/implementations/GT_MetaTileEntity_MultiBlockBase.java
@@ -714,6 +714,7 @@ public abstract class GT_MetaTileEntity_MultiBlockBase extends MetaTileEntity {
         IMetaTileEntity aMetaTileEntity = aTileEntity.getMetaTileEntity();
         if (aMetaTileEntity == null) return false;
         if (aMetaTileEntity instanceof GT_MetaTileEntity_Hatch_Maintenance) {
+        	((GT_MetaTileEntity_Hatch) aMetaTileEntity).mMachineBlock = (byte) aBaseCasingIndex;
             return mMaintenanceHatches.add((GT_MetaTileEntity_Hatch_Maintenance) aMetaTileEntity);
         }
         return false;