diff --git a/lib/binary_parser.js b/lib/binary_parser.js
index fadfaed7..e52eea42 100644
--- a/lib/binary_parser.js
+++ b/lib/binary_parser.js
@@ -309,7 +309,7 @@ Parser.prototype.addRawCode = function(ctx) {
 
   this.resolveReferences(ctx);
 
-  ctx.pushCode("return vars;");
+  ctx.pushCode("vars.__bytesRead = offset; return vars;");
 };
 
 Parser.prototype.addRawCodeEncode = function(ctx) {