diff --git a/core/java/android/os/Parcel.java b/core/java/android/os/Parcel.java
index f6e6ad6067bb0..0591fa8883c7a 100644
--- a/core/java/android/os/Parcel.java
+++ b/core/java/android/os/Parcel.java
@@ -692,11 +692,19 @@ public final class Parcel {
             return;
         }
         Set<Map.Entry<String,Object>> entries = val.entrySet();
-        writeInt(entries.size());
+        int size = entries.size();
+        writeInt(size);
+
         for (Map.Entry<String,Object> e : entries) {
             writeValue(e.getKey());
             writeValue(e.getValue());
+            size--;
         }
+
+        if (size != 0) {
+            throw new BadParcelableException("Map size does not match number of entries!");
+        }
+
     }
 
     /**