diff --git a/data/Dockerfiles/dovecot/Dockerfile b/data/Dockerfiles/dovecot/Dockerfile
index 815e670c..9756866e 100644
--- a/data/Dockerfiles/dovecot/Dockerfile
+++ b/data/Dockerfiles/dovecot/Dockerfile
@@ -2,7 +2,8 @@ FROM debian:buster-slim
 LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
 ARG DEBIAN_FRONTEND=noninteractive
-ARV DOVECOT_VERSION=2.3.10.1
+
+ENV DOVECOT 2.3.10.1
 ENV LC_ALL C
 
 # Add groups and users before installing Dovecot to not break compatibility
@@ -81,7 +82,7 @@ RUN groupadd -g 5000 vmail \
   syslog-ng-core \
   syslog-ng-mod-redis \
   && apt-key adv --fetch-keys https://repo.dovecot.org/DOVECOT-REPO-GPG \
-  && echo 'deb https://repo.dovecot.org/ce-${DOVECOT_VERSION}-latest/debian/buster buster main' > /etc/apt/sources.list.d/dovecot.list \
+  && echo 'deb https://repo.dovecot.org/ce-${DOVECOT}-latest/debian/buster buster main' > /etc/apt/sources.list.d/dovecot.list \
   && apt-get update \
   && apt-get -y --no-install-recommends install \
   dovecot-lua \