diff --git a/core/tests/coretests/src/android/view/MotionEventTest.java b/core/tests/coretests/src/android/view/MotionEventTest.java
index b3450de800920..d91836b7e018c 100644
--- a/core/tests/coretests/src/android/view/MotionEventTest.java
+++ b/core/tests/coretests/src/android/view/MotionEventTest.java
@@ -174,6 +174,7 @@ public class MotionEventTest {
     public void testEventRotation() {
         final MotionEvent event = MotionEvent.obtain(0 /* downTime */, 0 /* eventTime */,
                     ACTION_DOWN, 30 /* x */, 50 /* y */, 0 /* metaState */);
+        event.setSource(InputDevice.SOURCE_TOUCHSCREEN);
         MotionEvent rot90 = MotionEvent.obtain(event);
         rot90.transform(MotionEvent.createRotateMatrix(/* 90 deg */1, 1000, 600));
         assertEquals(50, (int) rot90.getX());