diff --git a/cocos/3d/CCBundleReader.h b/cocos/3d/CCBundleReader.h
index 4efc71f368bc..d71e17f74d72 100644
--- a/cocos/3d/CCBundleReader.h
+++ b/cocos/3d/CCBundleReader.h
@@ -87,7 +87,7 @@ class BundleReader: public cocos2d::Ref
     /**
      * Returns the position of the file pointer.
      */
-    long int tell();
+    ssize_t tell();
 
     /**
      * Sets the position of the file pointer.