diff --git a/src/libsystemd/sd-bus/bus-introspect.c b/src/libsystemd/sd-bus/bus-introspect.c
index cfcbd8b072..582e723e2e 100644
--- a/src/libsystemd/sd-bus/bus-introspect.c
+++ b/src/libsystemd/sd-bus/bus-introspect.c
@@ -63,7 +63,7 @@ int introspect_write_child_nodes(struct introspect *i, Set *s, const char *prefi
         return 0;
 }
 
-static void introspect_write_flags(struct introspect *i, int type, int flags) {
+static void introspect_write_flags(struct introspect *i, int type, uint64_t flags) {
         if (flags & SD_BUS_VTABLE_DEPRECATED)
                 fputs("   <annotation name=\"org.freedesktop.DBus.Deprecated\" value=\"true\"/>\n", i->f);