diff --git a/src/define.sh b/src/define.sh
index 5c1329d..32ce96b 100644
--- a/src/define.sh
+++ b/src/define.sh
@@ -5,6 +5,7 @@ set -Eeuo pipefail
 : "${HEIGHT:=""}"
 : "${VERIFY:=""}"
 : "${REGION:=""}"
+: "${EDITION:=""}"
 : "${MANUAL:=""}"
 : "${REMOVE:=""}"
 : "${VERSION:=""}"