diff --git a/src/util/virnetdevopenvswitch.h b/src/util/virnetdevopenvswitch.h
index 5cd1d22ae3..8409aa92ac 100644
--- a/src/util/virnetdevopenvswitch.h
+++ b/src/util/virnetdevopenvswitch.h
@@ -63,7 +63,7 @@ int virNetDevOpenvswitchInterfaceGetMaster(const char *ifname, char **master)
 int virNetDevOpenvswitchGetVhostuserIfname(const char *path,
                                            bool server,
                                            char **ifname)
-    ATTRIBUTE_NONNULL(2) G_GNUC_WARN_UNUSED_RESULT G_GNUC_NO_INLINE;
+    ATTRIBUTE_NONNULL(3) G_GNUC_WARN_UNUSED_RESULT G_GNUC_NO_INLINE;
 
 int virNetDevOpenvswitchUpdateVlan(const char *ifname,
                                    const virNetDevVlan *virtVlan)