diff --git a/lib/igt_kms.c b/lib/igt_kms.c
index d792008c..82bdec50 100644
--- a/lib/igt_kms.c
+++ b/lib/igt_kms.c
@@ -1025,6 +1025,7 @@ static int igt_primary_plane_commit_legacy(igt_plane_t *primary,
 
 	primary->pipe->enabled = (fb_id != 0);
 	primary->fb_changed = false;
+	primary->position_changed = false;
 
 	return 0;
 }