diff --git a/transform.go b/transform.go
index 8811f7e..790845d 100644
--- a/transform.go
+++ b/transform.go
@@ -140,6 +140,7 @@ func (t *Transform) Rotation() Float {
 
 func (t *Transform) Rotate(add Float) {
 	t.dirty = true
+	t.parentDirty = true
 	t.rotation += add
 }
 func (t *Transform) Around() Vector {
@@ -201,7 +202,8 @@ func (t *Transform) MatrixForParenting() (Matrix, Matrix) {
 	if t.parent != nil {
 		pm, pmi := t.parent.MatrixForParenting()
 		m.Concat(pm)
-		mi.Concat(pmi)
+		pmi.Concat(mi)
+		mi = pmi
 	}
 
 	return m, mi