diff --git a/FL/Fl_Arc_Dial.C b/FL/Fl_Arc_Dial.C
index 21ad64b..6562d95 100644
--- a/FL/Fl_Arc_Dial.C
+++ b/FL/Fl_Arc_Dial.C
@@ -45,6 +45,7 @@ Fl_Arc_Dial::handle ( int m )
                 v = maximum();
 
             value( v );
+            do_callback();
 
             return 1;
         }