diff --git a/agenda b/agenda
index f750baf..1212ada 100644
--- a/agenda
+++ b/agenda
@@ -2,7 +2,7 @@
 set -euo pipefail
 
 # The editor used to edit agenda note files.
-AGENDA_EDITOR=${VISUAL:-${EDITOR:-vi}}
+AGENDA_EDITOR=${AGENDA_EDITOR:-${VISUAL:-${EDITOR:-vi}}}
 
 # The home of all files read and written by agenda.
 #