diff --git a/src/constraint-disabled.c b/src/constraint-disabled.c
index 81ebc3e..c222eac 100644
--- a/src/constraint-disabled.c
+++ b/src/constraint-disabled.c
@@ -37,6 +37,11 @@ priv_constraint_check_child(pid_t pid, int status)
 {
 }
 
+void
+priv_constraint_kill(u_int32_t id)
+{
+}
+
 void
 priv_constraint_msg(u_int32_t id, u_int8_t *data, size_t len,
     const char *pw_dir, uid_t pw_uid, gid_t pw_gid)