diff --git a/Dockerfile b/Dockerfile
index f0adede..f4dc38b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 FROM alpine:latest
-RUN apk add --no-cache curl,supercronic
+RUN apk add --no-cache curl supercronic
 COPY entrypoint.sh opt
 COPY phc.sh opt
 RUN chmod +x /opt/entrypoint.sh