diff --git a/libs/canvas/step_button.cc b/libs/canvas/step_button.cc
index 289da2b43a..3692d95b3f 100644
--- a/libs/canvas/step_button.cc
+++ b/libs/canvas/step_button.cc
@@ -67,7 +67,7 @@ StepButton::compute_bounding_box () const
 {
 	_bounding_box = Rect (0, 0, width, height);
 
-	add_child_bounding_boxes ();
+	/* Item::bounding_box() will add children */
 
 	bb_clean ();
 }
diff --git a/libs/surfaces/maschine2/ui_knob.cc b/libs/surfaces/maschine2/ui_knob.cc
index cbcabb1bfe..9cff3aeb53 100644
--- a/libs/surfaces/maschine2/ui_knob.cc
+++ b/libs/surfaces/maschine2/ui_knob.cc
@@ -158,7 +158,7 @@ Maschine2Knob::compute_bounding_box () const
 		_bounding_box_dirty = false;
 	}
 
-	add_child_bounding_boxes ();
+	/* Item::bounding_box() will add children */
 }
 
 void
diff --git a/libs/surfaces/push2/knob.cc b/libs/surfaces/push2/knob.cc
index 05e830dfd0..1f40da5e43 100644
--- a/libs/surfaces/push2/knob.cc
+++ b/libs/surfaces/push2/knob.cc
@@ -251,7 +251,7 @@ Push2Knob::compute_bounding_box () const
 		_bounding_box_dirty = false;
 	}
 
-	add_child_bounding_boxes ();
+	/* Item::bounding_box() will add children */
 }
 
 void