diff --git a/OneSignalSDK/onesignal/core/src/main/AndroidManifest.xml b/OneSignalSDK/onesignal/core/src/main/AndroidManifest.xml
index 69421766c..285ce5c58 100644
--- a/OneSignalSDK/onesignal/core/src/main/AndroidManifest.xml
+++ b/OneSignalSDK/onesignal/core/src/main/AndroidManifest.xml
@@ -10,6 +10,13 @@
           android:permission="android.permission.BIND_JOB_SERVICE"
           android:exported="false" />
 
+        <!-- Temporary shim for old OneSignal v4 jobs pointing to com.onesignal.SyncJobService -->
+        <service
+            android:name="com.onesignal.SyncJobService"
+            android:permission="android.permission.BIND_JOB_SERVICE"
+            android:exported="false">
+        </service>
+
         <activity android:name="com.onesignal.core.activities.PermissionsActivity"
                   android:theme="@android:style/Theme.Translucent.NoTitleBar"
                   android:exported="false" />
diff --git a/OneSignalSDK/onesignal/core/src/main/java/com/onesignal/SyncJobService.kt b/OneSignalSDK/onesignal/core/src/main/java/com/onesignal/SyncJobService.kt
new file mode 100644
index 000000000..26b264f4e
--- /dev/null
+++ b/OneSignalSDK/onesignal/core/src/main/java/com/onesignal/SyncJobService.kt
@@ -0,0 +1,31 @@
+package com.onesignal
+
+import android.app.job.JobParameters
+import android.app.job.JobService
+
+/**
+ * Temporary shim for old OneSignal v4 jobs pointing to com.onesignal.SyncJobService.
+ *
+ * The v4 SyncJobService was used to run background sync; v5 has moved to a new architecture,
+ *  but scheduled jobs from the old service can still be lingering in JobScheduler on devices
+ *  that previously had v4 installed. When those old jobs fire, the system tries to instantiate
+ *  com.onesignal.SyncJobService. Since the class isn’t in the v5 SDK anymore, we will get a
+ *  ClassNotFoundException and a crash.
+ *
+ *  Providing a no-op implementation with the same fully qualified name lets those old jobs run
+ *   once, do nothing, and finish, which clears them out. This is intentionally a no-op and
+ *   finishes immediately.
+ */
+class SyncJobService : JobService() {
+
+    override fun onStartJob(params: JobParameters?): Boolean {
+        // Job finishes immediately, nothing to do.
+        jobFinished(params, false)
+        return false // No more work on a background thread.
+    }
+
+    override fun onStopJob(params: JobParameters?): Boolean {
+        // Don't reschedule the job.
+        return false
+    }
+}