diff --git a/src/util/vircgroup.h b/src/util/vircgroup.h
index bec88dc84e..46d3acee09 100644
--- a/src/util/vircgroup.h
+++ b/src/util/vircgroup.h
@@ -110,7 +110,7 @@ int virCgroupNewMachine(const char *name,
                         int controllers,
                         virCgroupPtr *group)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2)
-    ATTRIBUTE_NONNULL(4);
+    ATTRIBUTE_NONNULL(3);
 
 int virCgroupTerminateMachine(const char *name)
     ATTRIBUTE_NONNULL(1);