diff --git a/services/tests/mockingservicestests/src/com/android/server/pm/UserManagerServiceTest.java b/services/tests/mockingservicestests/src/com/android/server/pm/UserManagerServiceTest.java
index 7cd8819..d687915 100644
--- a/services/tests/mockingservicestests/src/com/android/server/pm/UserManagerServiceTest.java
+++ b/services/tests/mockingservicestests/src/com/android/server/pm/UserManagerServiceTest.java
@@ -320,11 +320,20 @@
     @Test
     public void testGetBootUser_Headless_ThrowsIfOnlySystemUserExists() throws Exception {
         setSystemUserHeadless(true);
+        removeNonSystemUsers();
 
         assertThrows(UserManager.CheckedUserOperationException.class,
                 () -> mUmi.getBootUser(/* waitUntilSet= */ false));
     }
 
+    private void removeNonSystemUsers() {
+        for (UserInfo user : mUms.getUsers(true)) {
+            if (!user.getUserHandle().isSystem()) {
+                mUms.removeUserInfo(user.id);
+            }
+        }
+    }
+
     private void mockCurrentUser(@UserIdInt int userId) {
         mockGetLocalService(ActivityManagerInternal.class, mActivityManagerInternal);