diff --git a/src/libcharon/bus/bus.c b/src/libcharon/bus/bus.c
index 144a06908e..b5cdaaa894 100644
--- a/src/libcharon/bus/bus.c
+++ b/src/libcharon/bus/bus.c
@@ -720,6 +720,10 @@ METHOD(bus_t, authorize, bool,
 	}
 	enumerator->destroy(enumerator);
 	this->mutex->unlock(this->mutex);
+	if (!success)
+	{
+		alert(this, ALERT_AUTHORIZATION_FAILED);
+	}
 	return success;
 }
 
diff --git a/src/libcharon/bus/bus.h b/src/libcharon/bus/bus.h
index 8dc38a8bf4..32b28c6c46 100644
--- a/src/libcharon/bus/bus.h
+++ b/src/libcharon/bus/bus.h
@@ -124,6 +124,8 @@ enum alert_t {
 	ALERT_UNIQUE_KEEP,
 	/** allocating virtual IP failed, linked_list_t of host_t requested */
 	ALERT_VIP_FAILURE,
+	/** an authorize() hook failed, no argument */
+	ALERT_AUTHORIZATION_FAILED,
 };
 
 /**