diff --git a/api/current.txt b/api/current.txt
index 3325dc6edf61a..d24928050a4fd 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -2991,7 +2991,6 @@ package android.app {
     field public int id;
     field public android.content.ComponentName origActivity;
     field public int persistentId;
-    field public int stackId;
   }
 
   public static class ActivityManager.RunningAppProcessInfo implements android.os.Parcelable {
diff --git a/core/java/android/app/ActivityManager.java b/core/java/android/app/ActivityManager.java
index 6ac2e80dce472..7c40bb15ac18c 100644
--- a/core/java/android/app/ActivityManager.java
+++ b/core/java/android/app/ActivityManager.java
@@ -490,6 +490,7 @@ public class ActivityManager {
 
         /**
          * The id of the ActivityStack this Task was on most recently.
+         * @hide
          */
         public int stackId;