diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index 5efdd1ae8..0a88312e5 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -346,6 +346,8 @@ ssize_t net_write (int fd, const void *buf, size_t nbytes);
 
 ssize_t net_read (int fd, void *buf, size_t nbytes);
 
+int netgroup_match(char*, char*, char*);
+
 int issuid(void);
 
 #ifndef HAVE_STRUCT_WINSIZE