diff --git a/core/java/android/view/ViewRootImpl.java b/core/java/android/view/ViewRootImpl.java
index 807af5b54081a..4c00f080c43d3 100644
--- a/core/java/android/view/ViewRootImpl.java
+++ b/core/java/android/view/ViewRootImpl.java
@@ -7072,7 +7072,11 @@ public final class ViewRootImpl implements ViewParent,
                 final MotionEvent event = (MotionEvent)q.mEvent;
                 final int source = event.getSource();
                 if ((source & InputDevice.SOURCE_CLASS_TRACKBALL) != 0) {
-                    mTrackball.process(event);
+                    // Do not synthesize events for relative mouse movement. If apps opt into
+                    // relative mouse movement they must be prepared to handle the events.
+                    if (!event.isFromSource(InputDevice.SOURCE_MOUSE_RELATIVE)) {
+                        mTrackball.process(event);
+                    }
                     return FINISH_HANDLED;
                 } else if ((source & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) {
                     mJoystick.process(event);