diff --git a/target/start-mailserver.sh b/target/start-mailserver.sh
index cb7afb49..a7862537 100644
--- a/target/start-mailserver.sh
+++ b/target/start-mailserver.sh
@@ -9,6 +9,7 @@
 declare -A DEFAULT_VARS
 DEFAULT_VARS["ENABLE_CLAMAV"]="${ENABLE_CLAMAV:="0"}"
 DEFAULT_VARS["ENABLE_SPAMASSASSIN"]="${ENABLE_SPAMASSASSIN:="0"}"
+DEFAULT_VARS["ENABLE_POP3"]="${ENABLE_POP3:="0"}"
 DEFAULT_VARS["ENABLE_FAIL2BAN"]="${ENABLE_FAIL2BAN:="0"}"
 DEFAULT_VARS["ENABLE_MANAGESIEVE"]="${ENABLE_MANAGESIEVE:="0"}"
 DEFAULT_VARS["ENABLE_FETCHMAIL"]="${ENABLE_FETCHMAIL:="0"}"