diff --git a/docker/Dockerfile.clockwork-0.9.9 b/docker/Dockerfile.clockwork-0.9.9
index fce2997..57c30f8 100644
--- a/docker/Dockerfile.clockwork-0.9.9
+++ b/docker/Dockerfile.clockwork-0.9.9
@@ -3,7 +3,6 @@ FROM debian:buster
 LABEL maintainer="pricea35@cardiff.ac.uk" \
 about.summary="container for the clockwork workflow"
 
-
 ENV samtools_version=1.12 \
 htslib_version=1.12 \
 bcftools_version=1.12 \