diff --git a/tinyxml2.h b/tinyxml2.h
index d5a3afd..cdd6880 100644
--- a/tinyxml2.h
+++ b/tinyxml2.h
@@ -2314,7 +2314,7 @@ public:
     	of the XML file in memory. (Note the size returned
     	includes the terminating null.)
     */
-    int CStrSize() const {
+    size_t CStrSize() const {
         return _buffer.Size();
     }
     /**