diff --git a/Core/Libraries/Source/debug/debug_debug.cpp b/Core/Libraries/Source/debug/debug_debug.cpp
index 77049750322..d04148c7423 100644
--- a/Core/Libraries/Source/debug/debug_debug.cpp
+++ b/Core/Libraries/Source/debug/debug_debug.cpp
@@ -1254,7 +1254,7 @@ void Debug::StartOutput(DebugIOInterface::StringType type, const char *fmt, ...)
   // potentially dangerous (fixed string buffer...)
   va_list va;
   va_start(va,fmt);
-  wvsprintf(curSource,fmt,va);
+  vsnprintf(curSource,sizeof(curSource),fmt,va);
   va_end(va);
   __ASSERT(curSource[sizeof(curSource)-1]==0);
 }