diff --git a/src/common/utils/string.hpp b/src/common/utils/string.hpp
index e9e5860..1d5cc5d 100644
--- a/src/common/utils/string.hpp
+++ b/src/common/utils/string.hpp
@@ -1,5 +1,6 @@
 #pragma once
 #include "memory.hpp"
+#include <cstdarg>
 #include <cstdint>
 
 template <class Type, size_t n>
@@ -29,7 +30,12 @@ namespace utils::string
 
 			while (true)
 			{
-				const auto res = vsnprintf_s(entry->buffer_, entry->size_, _TRUNCATE, format, ap);
+				va_list ap_copy;
+				va_copy(ap_copy, ap);
+
+				const auto res = vsnprintf_s(entry->buffer_, entry->size_, _TRUNCATE, format, ap_copy);
+				va_end(ap_copy);
+
 				if (res > 0) break; // Success
 				if (res == 0) return nullptr; // Error