diff --git a/.circleci/report-coverage.sh b/.circleci/report-coverage.sh
index 9f6cb79a78f0335f08f44b2f9c51a18ddbf95703..935ffb2629beb978c082cdbf190f0806a5437104 100755
--- a/.circleci/report-coverage.sh
+++ b/.circleci/report-coverage.sh
@@ -1,4 +1,5 @@
-#! /usr/bin/env bash
+#! /usr/bin/env nix-shell
+#! nix-shell -i bash -p "python.withPackages (ps: [ ps.coverage ])"
 set -x
 find ./result-doc/share/doc
 cp ./result-doc/share/doc/*/.coverage.* ./