diff --git a/winsup/cygwin/glob.cc b/winsup/cygwin/glob.cc
index 63a07a930..0b85a147a 100644
--- a/winsup/cygwin/glob.cc
+++ b/winsup/cygwin/glob.cc
@@ -481,12 +481,6 @@ globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
 	return patbuf;
 }
 
-static void
-wcitoascii(char *dst, wint_t *src)
-{
-	while ((*dst++ = *src++));
-}
-
 /*
  * The main glob() routine: compiles the pattern (optionally processing
  * quotes), calls glob1() to do the real pattern matching, and finally
diff --git a/winsup/cygwin/local_includes/wchar.h b/winsup/cygwin/local_includes/wchar.h
index 3907732a2..b09d014c0 100644
--- a/winsup/cygwin/local_includes/wchar.h
+++ b/winsup/cygwin/local_includes/wchar.h
@@ -52,6 +52,14 @@ size_t wirtomb (char *, wint_t, mbstate_t *);
    a UTF-32 value. Defined in strfuncs.cc */
 extern size_t mbrtowi (wint_t *, const char *, size_t, mbstate_t *);
 
+/* convert wint_t string to char string, but *only* if the string consists
+   entirely of ASCII chars */
+static inline void
+wcitoascii(char *dst, wint_t *src)
+{
+        while ((*dst++ = *src++));
+}
+
 /* like wcslen, just for wint_t */
 static inline size_t
 wcilen (const wint_t *wcs)