diff --git a/scripts/tkremind b/scripts/tkremind
index 2cea8a7b..a725f230 100755
--- a/scripts/tkremind
+++ b/scripts/tkremind
@@ -3418,6 +3418,7 @@ proc ShowTodaysReminders {} {
     global Option
     global Remind
     global ReminderFile
+    global TwentyFourHourMode
     if {!$Option(ShowTodaysReminders)} {
 	return
     }