diff --git a/core/postfix/Dockerfile b/core/postfix/Dockerfile
index 62ed5070..61af3248 100644
--- a/core/postfix/Dockerfile
+++ b/core/postfix/Dockerfile
@@ -2,7 +2,7 @@ FROM alpine:3.8
 
 RUN apk add --no-cache postfix postfix-pcre rsyslog \
  && python3 py3-pip \
- && pip3 install --upgrade pip \
+    pip3 install --upgrade pip \
  && pip3 install jinja2 podop tenacity
 
 COPY conf /conf