diff --git a/Utilities/StrFmt.h b/Utilities/StrFmt.h
index 430e65a8d0..d4e46917eb 100644
--- a/Utilities/StrFmt.h
+++ b/Utilities/StrFmt.h
@@ -85,7 +85,7 @@ namespace fmt{
 		{
 			std::vector<char> buffptr(length);
 #pragma clang diagnostic push
-#pragma clang diagnostic ignored "-wFormat-security"
+#pragma clang diagnostic ignored "-Wformat-security"
 			int printlen = snprintf(buffptr.data(), length, fmt.c_str(), std::forward<Args>(parameters)...);
 #pragma clang diagnostic pop
 			if (printlen >= 0 && printlen < length)