diff --git a/Dockerfile b/Dockerfile
index cea640e..34d0b35 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -26,7 +26,7 @@ LABEL maintainer="mritd <mritd@linux.com>"
 # set up nsswitch.conf for Go's "netgo" implementation
 # - https://github.com/golang/go/blob/go1.9.1/src/net/conf.go#L194-L275
 # - docker run --rm debian:stretch grep '^hosts:' /etc/nsswitch.conf
-RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf
+RUN if [ ! -e /etc/nsswitch.conf ]; then echo 'hosts: files dns' > /etc/nsswitch.conf; fi
 
 # bash is used for debugging, tzdata is used to add timezone information.
 # Install ca-certificates to ensure no CA certificate errors.