diff --git a/core/definitions.mk b/core/definitions.mk
index 9865d99..36bb0d4 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -990,7 +990,7 @@
 $(hide) $(DBUS_GENERATOR) \
 	--service-config=$(PRIVATE_DBUS_SERVICE_CONFIG) \
 	--proxy=$@ \
-	$<
+	$(filter %.dbus.xml,$^)
 endef