diff --git a/docker/download-packages.Dockerfile b/docker/download-packages.Dockerfile
index 2b5242c..964e10b 100644
--- a/docker/download-packages.Dockerfile
+++ b/docker/download-packages.Dockerfile
@@ -137,7 +137,7 @@ ARG LIBNFCT_VERSION
 ARG LIBNFCT_TAR
 WORKDIR /out/ask/libnfct
 RUN fetch-artifact \
-        "${LIBNFCT_VERSION_TAR}" \
+        "${LIBNFCT_TAR}" \
         "${LIBNFCT_VERSION}.tar.xz" \
         "https://www.netfilter.org/projects/libnetfilter_conntrack/files/libnetfilter_conntrack-${LIBNFCT_VERSION}.tar.xz"