diff --git a/hooks.c b/hooks.c
index 46faf80..32952a9 100644
--- a/hooks.c
+++ b/hooks.c
@@ -86,7 +86,9 @@ struct luadata *hooks_init(struct udata *ud, char *script)
 	ld->L = luaL_newstate();
 	luaL_openlibs(ld->L);
 
+#ifdef WITH_MQTT
 	MQTTconn = ud->mosq;
+#endif
 
 	/*
 	 * Set up a global with some values.