diff --git a/gtk2_ardour/ardour3_widget_list.rc b/gtk2_ardour/ardour3_widget_list.rc
index 0d76dde59c..6d710b7067 100644
--- a/gtk2_ardour/ardour3_widget_list.rc
+++ b/gtk2_ardour/ardour3_widget_list.rc
@@ -394,3 +394,4 @@ widget "*transport option button" style:highest "small_text"
 widget "*transport active option button" style:highest "small_text"
 widget "*plugin bypass button" style:highest "small_text"
 widget "*punch button" style:highest "small_text"
+widget "*lock button" style:highest "large_bold_text"