diff --git a/Dockerfile b/Dockerfile
index 9997ac1..e285fb5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,7 +15,7 @@ RUN buildDeps='curl gcc libc6-dev libevent-dev make perl' \
 	&& apt-get update && apt-get install -y $buildDeps --no-install-recommends \
 	&& rm -rf /var/lib/apt/lists/* \
 	&& curl -SL "http://memcached.org/files/memcached-$MEMCACHED_VERSION.tar.gz" -o memcached.tar.gz \
-	&& echo "$MEMCACHED_SHA1 memcached.tar.gz" | sha1sum -c - \
+	&& echo "$MEMCACHED_SHA1  memcached.tar.gz" | sha1sum -c - \
 	&& mkdir -p /usr/src/memcached \
 	&& tar -xzf memcached.tar.gz -C /usr/src/memcached --strip-components=1 \
 	&& rm memcached.tar.gz \