diff --git a/types/xdg_shell/wlr_xdg_positioner.c b/types/xdg_shell/wlr_xdg_positioner.c
index 0213c572..6f902f92 100644
--- a/types/xdg_shell/wlr_xdg_positioner.c
+++ b/types/xdg_shell/wlr_xdg_positioner.c
@@ -256,6 +256,8 @@ static enum xdg_positioner_anchor positioner_anchor_invert_x(
 		return XDG_POSITIONER_ANCHOR_LEFT;
 	case XDG_POSITIONER_ANCHOR_TOP_LEFT:
 		return XDG_POSITIONER_ANCHOR_TOP_RIGHT;
+	case XDG_POSITIONER_ANCHOR_TOP_RIGHT:
+		return XDG_POSITIONER_ANCHOR_TOP_LEFT;
 	case XDG_POSITIONER_ANCHOR_BOTTOM_LEFT:
 		return XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT;
 	case XDG_POSITIONER_ANCHOR_BOTTOM_RIGHT: