diff --git a/include/date/date.h b/include/date/date.h
index 481db2b..5731bbb 100644
--- a/include/date/date.h
+++ b/include/date/date.h
@@ -96,7 +96,9 @@ namespace date
 
 #if defined(_MSC_VER) && (!defined(__clang__) || (_MSC_VER < 1910))
 // MSVC
-#  define _SILENCE_CXX17_UNCAUGHT_EXCEPTION_DEPRECATION_WARNING
+#  ifndef _SILENCE_CXX17_UNCAUGHT_EXCEPTION_DEPRECATION_WARNING
+#    define _SILENCE_CXX17_UNCAUGHT_EXCEPTION_DEPRECATION_WARNING
+#  endf
 #  if _MSC_VER < 1910
 //   before VS2017
 #    define CONSTDATA const