diff --git a/src/main/java/li/cil/oc2/common/bus/AbstractDeviceBusElement.java b/src/main/java/li/cil/oc2/common/bus/AbstractDeviceBusElement.java
index cf5dac17..333268d5 100644
--- a/src/main/java/li/cil/oc2/common/bus/AbstractDeviceBusElement.java
+++ b/src/main/java/li/cil/oc2/common/bus/AbstractDeviceBusElement.java
@@ -63,7 +63,7 @@ public abstract class AbstractDeviceBusElement implements DeviceBusElement {
     @Override
     public Collection<Device> getDevices() {
         if (!controllers.isEmpty()) {
-            return controllers.stream().flatMap(controller -> getDevices().stream()).collect(Collectors.toList());
+            return controllers.stream().flatMap(controller -> getDevices().stream()).collect(Collectors.toSet());
         } else {
             return getLocalDevices();
         }