diff --git a/winsup/cygwin/cygwin.din b/winsup/cygwin/cygwin.din
index 9f9cd7f9b..37896c0c3 100644
--- a/winsup/cygwin/cygwin.din
+++ b/winsup/cygwin/cygwin.din
@@ -1077,6 +1077,8 @@ mbrlen
 _mbrlen = mbrlen
 mbrtowc
 _mbrtowc = mbrtowc
+mbsrtowcs
+_mbsrtowcs = mbsrtowcs
 wcrtomb
 _wcrtomb = wcrtomb
 wcsrtombs