diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index 777c22a..2c37624 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -542,7 +542,7 @@
         return BAD_VALUE;
     }
 
-    if ((mDataSize+len) > mDataCapacity) {
+    if ((mDataPos + len) > mDataCapacity) {
         // grow data
         err = growData(len);
         if (err != NO_ERROR) {