diff --git a/tools/snap/build_dns.sh b/tools/snap/build_dns.sh
index 48cf567e2..3553ab106 100755
--- a/tools/snap/build_dns.sh
+++ b/tools/snap/build_dns.sh
@@ -67,6 +67,6 @@ docker run \
   -v "${SNAP_CONSTRAINTS}:/snap-constraints.txt" \
   -w "/certbot" \
   -e "DNS_PLUGINS=${DNS_PLUGINS}" \
+  -e "PIP_EXTRA_INDEX_URL=http://localhost:8080" \
   "adferrand/snapcraft:${DOCKER_ARCH}-stable" \
   /script.sh
-  #-e "PIP_EXTRA_INDEX_URL=http://localhost:8080" \
\ No newline at end of file