diff --git a/apex/jobscheduler/service/java/com/android/server/alarm/UserWakeupStore.java b/apex/jobscheduler/service/java/com/android/server/alarm/UserWakeupStore.java
index dc5e341..93904a7 100644
--- a/apex/jobscheduler/service/java/com/android/server/alarm/UserWakeupStore.java
+++ b/apex/jobscheduler/service/java/com/android/server/alarm/UserWakeupStore.java
@@ -20,6 +20,7 @@
 import android.annotation.Nullable;
 import android.os.Environment;
 import android.os.SystemClock;
+import android.os.UserHandle;
 import android.util.AtomicFile;
 import android.util.IndentingPrintWriter;
 import android.util.Pair;
@@ -113,15 +114,18 @@
     }
 
     /**
-     * Add user wakeup for the alarm.
+     * Add user wakeup for the alarm if needed.
      * @param userId Id of the user that scheduled alarm.
      * @param alarmTime time when alarm is expected to trigger.
      */
     public void addUserWakeup(int userId, long alarmTime) {
-        synchronized (mUserWakeupLock) {
-            mUserStarts.put(userId, alarmTime - BUFFER_TIME_MS + getUserWakeupOffset());
+        // SYSTEM user is always running, so no need to schedule wakeup for it.
+        if (userId != UserHandle.USER_SYSTEM) {
+            synchronized (mUserWakeupLock) {
+                mUserStarts.put(userId, alarmTime - BUFFER_TIME_MS + getUserWakeupOffset());
+            }
+            updateUserListFile();
         }
-        updateUserListFile();
     }
 
     /**
diff --git a/services/tests/mockingservicestests/src/com/android/server/alarm/UserWakeupStoreTest.java b/services/tests/mockingservicestests/src/com/android/server/alarm/UserWakeupStoreTest.java
index 72883e2..5bd919f 100644
--- a/services/tests/mockingservicestests/src/com/android/server/alarm/UserWakeupStoreTest.java
+++ b/services/tests/mockingservicestests/src/com/android/server/alarm/UserWakeupStoreTest.java
@@ -23,6 +23,7 @@
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
+import static org.testng.AssertJUnit.assertFalse;
 
 import android.os.Environment;
 import android.os.FileUtils;
@@ -51,6 +52,7 @@
     private static final int USER_ID_1 = 10;
     private static final int USER_ID_2 = 11;
     private static final int USER_ID_3 = 12;
+    private static final int USER_ID_SYSTEM = 0;
     private static final long TEST_TIMESTAMP = 150_000;
     private static final File TEST_SYSTEM_DIR = new File(InstrumentationRegistry
             .getInstrumentation().getContext().getDataDir(), "alarmsTestDir");
@@ -110,6 +112,14 @@
     }
 
     @Test
+    public void testAddWakeupForSystemUser_shouldDoNothing() {
+        mUserWakeupStore.addUserWakeup(USER_ID_SYSTEM, TEST_TIMESTAMP - 19_000);
+        assertEquals(0, mUserWakeupStore.getUserIdsToWakeup(TEST_TIMESTAMP).length);
+        final File file = new File(ROOT_DIR , "usersWithAlarmClocks.xml");
+        assertFalse(file.exists());
+    }
+
+    @Test
     public void testAddMultipleWakeupsForUser_ensureOnlyLastWakeupRemains() {
         final long finalAlarmTime = TEST_TIMESTAMP - 13_000;
         mUserWakeupStore.addUserWakeup(USER_ID_1, TEST_TIMESTAMP - 29_000);