diff --git a/functions.cpp b/functions.cpp
index 42d3594..4b5570c 100644
--- a/functions.cpp
+++ b/functions.cpp
@@ -69,9 +69,10 @@ std::wstring LMsg( int id, ... ) {
         return local;
 
     va_start( args, id );
-    int len = vswprintf( nullptr, 0, local, args );
+    // _vscprintf doesn't count ending '\0'
+    int len = _vscprintf( local, args ) + 1;
     va_end( args );
-    wchar_t *text = new wchar_t[len + 1];
+    wchar_t *text = new wchar_t[len];
     va_start( args, id );
     vswprintf( text, len + 1, local, args );
     std::wstring ret = text;