diff --git a/src/main/java/com/gregtechceu/gtceu/api/machine/feature/multiblock/IMultiPart.java b/src/main/java/com/gregtechceu/gtceu/api/machine/feature/multiblock/IMultiPart.java
index 8225cd64bb..76d5207029 100644
--- a/src/main/java/com/gregtechceu/gtceu/api/machine/feature/multiblock/IMultiPart.java
+++ b/src/main/java/com/gregtechceu/gtceu/api/machine/feature/multiblock/IMultiPart.java
@@ -14,6 +14,7 @@
 import net.minecraft.world.level.block.state.BlockState;
 
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.UnmodifiableView;
 
 import java.util.List;
 import java.util.SortedSet;
@@ -43,8 +44,11 @@ default boolean canShared() {
     boolean isFormed();
 
     /**
-     * Get all attached controllers
+     * Get this MultiPart's controllers
+     * 
+     * @return An Unmodifiable View of the part's controllers
      */
+    @UnmodifiableView
     SortedSet<IMultiController> getControllers();
 
     /**
diff --git a/src/main/java/com/gregtechceu/gtceu/api/machine/multiblock/part/MultiblockPartMachine.java b/src/main/java/com/gregtechceu/gtceu/api/machine/multiblock/part/MultiblockPartMachine.java
index a6b1c3ac16..2e1e9aebe4 100644
--- a/src/main/java/com/gregtechceu/gtceu/api/machine/multiblock/part/MultiblockPartMachine.java
+++ b/src/main/java/com/gregtechceu/gtceu/api/machine/multiblock/part/MultiblockPartMachine.java
@@ -17,6 +17,7 @@
 
 import it.unimi.dsi.fastutil.objects.ObjectOpenHashSet;
 import it.unimi.dsi.fastutil.objects.ReferenceLinkedOpenHashSet;
+import org.jetbrains.annotations.UnmodifiableView;
 
 import java.util.Collections;
 import java.util.List;
@@ -78,6 +79,7 @@ public void onControllersUpdated(Set<BlockPos> newPositions, Set<BlockPos> old)
     }
 
     @Override
+    @UnmodifiableView
     public SortedSet<IMultiController> getControllers() {
         // Necessary to rebuild the set of controllers on client-side
         if (controllers.size() != controllerPositions.size()) {