diff --git a/services/core/java/com/android/server/testharness/TestHarnessModeService.java b/services/core/java/com/android/server/testharness/TestHarnessModeService.java
index c2ecd41e7dbfd..735a9e41a03bb 100644
--- a/services/core/java/com/android/server/testharness/TestHarnessModeService.java
+++ b/services/core/java/com/android/server/testharness/TestHarnessModeService.java
@@ -161,6 +161,10 @@ public class TestHarnessModeService extends SystemService {
     private void configureSettings() {
         ContentResolver cr = getContext().getContentResolver();
 
+        // Stop ADB before we enable it, otherwise on userdebug/eng builds, the keys won't have
+        // registered with adbd, and it will prompt the user to confirm the keys.
+        Settings.Global.putInt(cr, Settings.Global.ADB_ENABLED, 0);
+
         // Disable the TTL for ADB keys before enabling ADB
         Settings.Global.putLong(cr, Settings.Global.ADB_ALLOWED_CONNECTION_TIME, 0);
         Settings.Global.putInt(cr, Settings.Global.ADB_ENABLED, 1);