diff --git a/app/src/main/kotlin/at/bitfire/davdroid/sync/SyncAdapterServices.kt b/app/src/main/kotlin/at/bitfire/davdroid/sync/SyncAdapterServices.kt
index ad1b1792e..3d056bcd0 100644
--- a/app/src/main/kotlin/at/bitfire/davdroid/sync/SyncAdapterServices.kt
+++ b/app/src/main/kotlin/at/bitfire/davdroid/sync/SyncAdapterServices.kt
@@ -175,17 +175,19 @@ abstract class SyncAdapterService: Service() {
 
 // exported sync adapter services; we need a separate class for each authority
 
+abstract class FakeSyncAdapterService: SyncAdapterService()
+
 @AndroidEntryPoint
-class CalendarsSyncAdapterService: SyncAdapterService()
+class CalendarsSyncAdapterService: FakeSyncAdapterService()
 
 @AndroidEntryPoint
-class ContactsSyncAdapterService: SyncAdapterService()
+class ContactsSyncAdapterService: FakeSyncAdapterService()
 
 @AndroidEntryPoint
-class JtxSyncAdapterService: SyncAdapterService()
+class JtxSyncAdapterService: FakeSyncAdapterService()
 
 @AndroidEntryPoint
-class OpenTasksSyncAdapterService: SyncAdapterService()
+class OpenTasksSyncAdapterService: FakeSyncAdapterService()
 
 @AndroidEntryPoint
-class TasksOrgSyncAdapterService: SyncAdapterService()
\ No newline at end of file
+class TasksOrgSyncAdapterService: FakeSyncAdapterService()
\ No newline at end of file