diff --git a/src/libs/gui_tk/gui_tk.h b/src/libs/gui_tk/gui_tk.h
index f57a58220b..01727de6da 100644
--- a/src/libs/gui_tk/gui_tk.h
+++ b/src/libs/gui_tk/gui_tk.h
@@ -2602,7 +2602,7 @@ class Radiobox : public BorderedWindow, public ActionEventSource {
 		(void)y;//UNUSED
 
 		if (button == Left) {
-			checked = !checked;
+			checked = true;
 			execute();
 			return true;
 		}