diff --git a/libs/widgets/ardour_button.cc b/libs/widgets/ardour_button.cc
index 7e4a397b9f..53f4bb09d2 100644
--- a/libs/widgets/ardour_button.cc
+++ b/libs/widgets/ardour_button.cc
@@ -691,12 +691,10 @@ ArdourButton::on_size_request (Gtk::Requisition* req)
 	req->width = req->height = 0;
 	CairoWidget::on_size_request (req);
 
-	if (_diameter == 0) {
-		const float newdia = rintf (11.f * UIConfigurationBase::instance().get_ui_scale());
-		if (_diameter != newdia) {
-			_pattern_height = 0;
-			_diameter = newdia;
-		}
+	const float newdia = rintf (11.f * UIConfigurationBase::instance().get_ui_scale());
+	if (_diameter != newdia) {
+		_pattern_height = 0;
+		_diameter = newdia;
 	}
 
 	if (_elements & Text) {