diff --git a/SAX/helpers/XMLBaseSupport.h b/SAX/helpers/XMLBaseSupport.h
index 4aba90ee..e7900eb1 100644
--- a/SAX/helpers/XMLBaseSupport.h
+++ b/SAX/helpers/XMLBaseSupport.h
@@ -90,7 +90,7 @@ private:
     static const stringT SCHEME_MARKER = SA_.makeStringT("://");
     static const valueT FORWARD_SLASH = SA_.makeValueT(Arabica::Unicode<char>::SLASH);
 
-    if(location.find(SCHEME_MARKER) != -1)
+    if(location.find(SCHEME_MARKER) != stringT::npos)
       return location;
 
     std::ostringstream ss;
@@ -160,4 +160,5 @@ typedef basic_XMLBaseSupport<std::wstring> wXMLBaseSupport;
 
 } // namespace SAX
 
-#endif
\ No newline at end of file
+#endif
+