diff --git a/Utilities/StrFmt.cpp b/Utilities/StrFmt.cpp
index e67437ae00..fc469c7b79 100644
--- a/Utilities/StrFmt.cpp
+++ b/Utilities/StrFmt.cpp
@@ -14,8 +14,8 @@ std::string fmt::FormatV(const char *fmt, va_list args)
 	for (;;)
 	{
 		std::vector<char> buffptr(length);
-		int printlen = vsnprintf(buffptr.data(), length, fmt, args);
-		if (printlen >= 0 && printlen < length)
+		size_t printlen = vsnprintf(buffptr.data(), length, fmt, args);
+		if (printlen < length)
 		{
 			str = std::string(buffptr.data(), printlen);
 			break;
diff --git a/Utilities/StrFmt.h b/Utilities/StrFmt.h
index d4e46917eb..744d6ea189 100644
--- a/Utilities/StrFmt.h
+++ b/Utilities/StrFmt.h
@@ -86,9 +86,9 @@ namespace fmt{
 			std::vector<char> buffptr(length);
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wformat-security"
-			int printlen = snprintf(buffptr.data(), length, fmt.c_str(), std::forward<Args>(parameters)...);
+			size_t printlen = snprintf(buffptr.data(), length, fmt.c_str(), std::forward<Args>(parameters)...);
 #pragma clang diagnostic pop
-			if (printlen >= 0 && printlen < length)
+			if (printlen < length)
 			{
 				str = string(buffptr.data(), printlen);
 				break;