diff --git a/Tethering/tests/integration/base/android/net/EthernetTetheringTestBase.java b/Tethering/tests/integration/base/android/net/EthernetTetheringTestBase.java
index f2cf1d0..69eb58f 100644
--- a/Tethering/tests/integration/base/android/net/EthernetTetheringTestBase.java
+++ b/Tethering/tests/integration/base/android/net/EthernetTetheringTestBase.java
@@ -253,6 +253,7 @@
             if (mRunTests) cleanUp();
         } finally {
             mHandlerThread.quitSafely();
+            mHandlerThread.join();
             mUiAutomation.dropShellPermissionIdentity();
         }
     }