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 8be2c95a..fe4d5435 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
@@ -209,7 +209,7 @@ public abstract class GT_MetaTileEntity_MultiBlockBase extends MetaTileEntity {
                     for (GT_MetaTileEntity_Hatch_Maintenance tHatch : mMaintenanceHatches) {
                         if (isValidMetaTileEntity(tHatch)) {
                             if (!this.disableMaintenance) {
-                            	tHatch.setController(this);
+                            	tHatch.setController((GT_MetaTileEntity_MultiBlockBase) aBaseMetaTileEntity);
                                 if (tHatch.mWrench) mWrench = true;
                                 if (tHatch.mScrewdriver) mScrewdriver = true;
                                 if (tHatch.mSoftHammer) mSoftHammer = true;
@@ -768,7 +768,7 @@ public abstract class GT_MetaTileEntity_MultiBlockBase extends MetaTileEntity {
         if (aMetaTileEntity == null) return false;
         if (aMetaTileEntity instanceof GT_MetaTileEntity_Hatch_Maintenance) {
             ((GT_MetaTileEntity_Hatch) aMetaTileEntity).mMachineBlock = (byte) aBaseCasingIndex;
-            ((GT_MetaTileEntity_Hatch_Maintenance) aMetaTileEntity).setController(this);
+            ((GT_MetaTileEntity_Hatch_Maintenance) aMetaTileEntity).setController((GT_MetaTileEntity_MultiBlockBase) aTileEntity);
             return mMaintenanceHatches.add((GT_MetaTileEntity_Hatch_Maintenance) aMetaTileEntity);
         }
         return false;