diff --git a/services/core/java/com/android/server/wm/WindowProcessController.java b/services/core/java/com/android/server/wm/WindowProcessController.java
index 3672820c13ad9..d7d2b4e9dde2a 100644
--- a/services/core/java/com/android/server/wm/WindowProcessController.java
+++ b/services/core/java/com/android/server/wm/WindowProcessController.java
@@ -563,7 +563,7 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio
             return;
         }
 
-        final long diff = lastLaunchTime - launchTime;
+        final long diff = launchTime - lastLaunchTime;
         if (diff < RAPID_ACTIVITY_LAUNCH_MS) {
             mRapidActivityLaunchCount++;
         } else if (diff >= RESET_RAPID_ACTIVITY_LAUNCH_MS) {