diff --git a/earwigbot/commands/remind.py b/earwigbot/commands/remind.py
index 65638fe..1b3d524 100644
--- a/earwigbot/commands/remind.py
+++ b/earwigbot/commands/remind.py
@@ -255,7 +255,7 @@ class Remind(Command):
         """Handle a reminder-processing subcommand."""
         user = data.host
         reminder = None
-        if args and args[0].startswith("R"):
+        if args and args[0].upper().startswith("R"):
             try:
                 reminder = self._get_reminder_by_id(user, args[0])
             except IndexError: