diff --git a/include/rapidjson/document.h b/include/rapidjson/document.h
index 74089cb9b..616bedeb7 100644
--- a/include/rapidjson/document.h
+++ b/include/rapidjson/document.h
@@ -698,7 +698,7 @@ class GenericValue {
 
 private:
     //! Copy constructor is not permitted.
-    GenericValue(const GenericValue& rhs);
+    GenericValue(const GenericValue& rhs) = delete;
 
 #if RAPIDJSON_HAS_CXX11_RVALUE_REFS
     //! Moving from a GenericDocument is not permitted.