diff --git a/Dockerfile b/Dockerfile
index 9ac2897..eb9b011 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ ARG USERNAME=msmtp
 COPY start-container.sh /usr/local/bin/start-container
 
 RUN adduser -D $USERNAME \
-    && apk add msmtp
+    && apk add msmtp \
     && chmod +x /usr/local/bin/start-container
 
 USER $USERNAME