diff --git a/modules/core/include/opencv2/core/cvstd.hpp b/modules/core/include/opencv2/core/cvstd.hpp
index dff0b20cf4..edae954fff 100644
--- a/modules/core/include/opencv2/core/cvstd.hpp
+++ b/modules/core/include/opencv2/core/cvstd.hpp
@@ -576,6 +576,8 @@ private:
 
     char* allocate(size_t len); // len without trailing 0
     void deallocate();
+
+    String(int); // disabled and invalid. Catch invalid usages like, commandLineParser.has(0) problem
 };
 
 //! @} core_basic