diff --git a/Dockerfile b/Dockerfile
index 9dc641f..1564ae7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,7 +15,7 @@ ARG DEBCONF_NOWARNINGS="yes"
 ARG DEBIAN_FRONTEND="noninteractive"
 ARG DEBCONF_NONINTERACTIVE_SEEN="true"
 
-RUN set -eu && extra="" && \
+RUN set -eu && \
     apt-get update && \
     apt-get --no-install-recommends -y install \
         jq \