diff --git a/quickstep/src/com/android/quickstep/TouchInteractionService.java b/quickstep/src/com/android/quickstep/TouchInteractionService.java
index a9aa8f8..75e7c64 100644
--- a/quickstep/src/com/android/quickstep/TouchInteractionService.java
+++ b/quickstep/src/com/android/quickstep/TouchInteractionService.java
@@ -523,7 +523,8 @@
         }
 
         protected void onOverviewTargetChange() {
-            for (Runnable listener : mOnOverviewTargetChangeListeners) {
+            Set<Runnable> listeners = new HashSet<>(mOnOverviewTargetChangeListeners);
+            for (Runnable listener : listeners) {
                 listener.run();
             }
         }