diff --git a/include/__std_stream b/include/__std_stream
index e562e2c4..fa194ea8 100644
--- a/include/__std_stream
+++ b/include/__std_stream
@@ -150,7 +150,7 @@ __stdinbuf<_CharT>::__getchar(bool __consume)
     {
         for (int __i = __nread; __i > 0;)
         {
-            if (ungetc(__extbuf[--__i], __file_) == EOF)
+            if (ungetc(traits_type::to_int_type(__extbuf[--__i]), __file_) == EOF)
                 return traits_type::eof();
         }
     }