diff --git a/servers/slapd/proto-slap.h b/servers/slapd/proto-slap.h
index d13ad23b35..5c6fc6e947 100644
--- a/servers/slapd/proto-slap.h
+++ b/servers/slapd/proto-slap.h
@@ -26,6 +26,8 @@ int acl_check_modlist LDAP_P(( Backend *be,
 
 void acl_append( AccessControl **l, AccessControl *a );
 
+char *get_supported_acimech LDAP_P((int index));
+
 /*
  * aclparse.c
  */