diff --git a/Control/AthenaMP/src/memory-monitor/rapidjson/document.h b/Control/AthenaMP/src/memory-monitor/rapidjson/document.h
index 2dce56c1c99611048466be7bf846bf238e0c0491..68166df10e4e550c29d4885b97e774da9b75b8e9 100644
--- a/Control/AthenaMP/src/memory-monitor/rapidjson/document.h
+++ b/Control/AthenaMP/src/memory-monitor/rapidjson/document.h
@@ -325,6 +325,8 @@ struct GenericStringRef {
     GenericStringRef(const CharType* str, SizeType len)
         : s(str), length(len) { RAPIDJSON_ASSERT(s != NULL); }
 
+    GenericStringRef( const GenericStringRef& ) = default;
+
     //! implicit conversion to plain CharType pointer
     operator const Ch *() const { return s; }