diff --git a/main.c b/main.c
index 86e3055..2f46cb3 100644
--- a/main.c
+++ b/main.c
@@ -1325,6 +1325,7 @@ cal_interpolate(int s)
   }
     
   cal_status |= src->_cal_status | CALSTAT_APPLY | CALSTAT_INTERPOLATED;
+  redraw_request |= REDRAW_CAL_STATUS;
 }
 
 static void cmd_cal(BaseSequentialStream *chp, int argc, char *argv[])