diff --git a/reactos/include/reactos/wine/test.h b/reactos/include/reactos/wine/test.h
index fdf3c886ec5..97d1d11101f 100644
--- a/reactos/include/reactos/wine/test.h
+++ b/reactos/include/reactos/wine/test.h
@@ -488,7 +488,7 @@ const char *wine_dbgstr_wn( const WCHAR *str, int n )
         case '\\': *dst++ = '\\'; *dst++ = '\\'; break;
         default:
             if (c >= ' ' && c <= 126)
-                *dst++ = c;
+                *dst++ = (char)c;
             else
             {
                 *dst++ = '\\';