diff --git a/run-tests.sh b/run-tests.sh
index 66c27be..56eb654 100755
--- a/run-tests.sh
+++ b/run-tests.sh
@@ -6,6 +6,7 @@ cd tests/grav
 # Work around nix build failing due to git failing with
 #     The following paths are ignored by one of your .gitignore files:
 #     tests/grav/flake.lock
+rm flake.lock
 nix flake lock || true
 git add --intent-to-add flake.lock -f