diff --git a/app/src/main/java/de/ccc/events/badge/card10/MainActivity.kt b/app/src/main/java/de/ccc/events/badge/card10/MainActivity.kt
index 0c8216252bf4b186f389ecf7e2e7341f7745f112..441ee2a2d14943e24ae8c0b887ed7e94a32a46c6 100644
--- a/app/src/main/java/de/ccc/events/badge/card10/MainActivity.kt
+++ b/app/src/main/java/de/ccc/events/badge/card10/MainActivity.kt
@@ -104,7 +104,7 @@ class MainActivity : AppCompatActivity() {
                 .commit()
         }
 
-        val workManager = WorkManager.getInstance()
+        val workManager = WorkManager.getInstance(this)
         if (!bluetoothAdapter.bondedDevices.isEmpty()
         ) {
             val setClockRequest =