diff --git a/source/mijin/debug/stacktrace.hpp b/source/mijin/debug/stacktrace.hpp
index fdc68f6..d49843e 100644
--- a/source/mijin/debug/stacktrace.hpp
+++ b/source/mijin/debug/stacktrace.hpp
@@ -72,7 +72,7 @@ TStream& operator<<(TStream& stream, const Stackframe& stackframe)
 template<typename TStream>
 TStream& operator<<(TStream& stream, const Stacktrace& stacktrace)
 {
-    const int oldWidth = stream.width();
+    const std::streamsize oldWidth = stream.width();
     const std::ios::fmtflags oldFlags = stream.flags();
     const int numDigits = static_cast<int>(std::ceil(std::log10(stacktrace.getFrames().size())));
     stream << std::left;