diff --git a/services/tests/mockingservicestests/src/android/service/games/GameSessionTrampolineActivityTest.java b/services/tests/mockingservicestests/src/android/service/games/GameSessionTrampolineActivityTest.java
index 353341ed29857..82e02ca12296a 100644
--- a/services/tests/mockingservicestests/src/android/service/games/GameSessionTrampolineActivityTest.java
+++ b/services/tests/mockingservicestests/src/android/service/games/GameSessionTrampolineActivityTest.java
@@ -47,11 +47,14 @@ import androidx.test.filters.SmallTest;
 
 import com.android.internal.infra.AndroidFuture;
 
+import com.google.common.util.concurrent.Uninterruptibles;
+
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
+import java.time.Duration;
 import java.util.concurrent.TimeUnit;
 
 /**
@@ -62,6 +65,8 @@ import java.util.concurrent.TimeUnit;
 @Presubmit
 public class GameSessionTrampolineActivityTest {
 
+    private static final Duration TEST_ACTIVITY_OPEN_DURATION = Duration.ofSeconds(5);
+
     @Before
     public void setUp() {
         setAlwaysFinishActivities(false);
@@ -145,10 +150,15 @@ public class GameSessionTrampolineActivityTest {
             startTestActivityViaGameSessionTrampolineActivity() {
         Intent testActivityIntent = new Intent();
         testActivityIntent.setClass(getInstrumentation().getTargetContext(), TestActivity.class);
+        sleep(TEST_ACTIVITY_OPEN_DURATION);
 
         return startGameSessionTrampolineActivity(testActivityIntent);
     }
 
+    private static void sleep(Duration sleepDuration) {
+        Uninterruptibles.sleepUninterruptibly(sleepDuration.toMillis(), TimeUnit.MILLISECONDS);
+    }
+
     private static AndroidFuture<GameSessionActivityResult> startGameSessionTrampolineActivity(
             Intent targetIntent) {
         AndroidFuture<GameSessionActivityResult> resultFuture = new AndroidFuture<>();