diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/DeviceCommunicationService.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/DeviceCommunicationService.java
index 2a0043a75..022fa3e13 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/DeviceCommunicationService.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/DeviceCommunicationService.java
@@ -120,7 +120,7 @@ public class DeviceCommunicationService extends Service {
     }
 
     @Override
-    public int onStartCommand(Intent intent, int flags, int startId) {
+    public synchronized int onStartCommand(Intent intent, int flags, int startId) {
 
         if (intent == null) {
             LOG.info("no intent");