diff --git a/tests/flakes.sh b/tests/flakes.sh
index 283c2e397..8cd814a29 100644
--- a/tests/flakes.sh
+++ b/tests/flakes.sh
@@ -574,6 +574,7 @@ nix flake info --json hg+file://$flake5Dir
 nix build -o $TEST_ROOT/result hg+file://$flake5Dir --no-registries --no-allow-dirty
 
 # Test tarball flakes
+rm -rf $flake5Dir/.hg
 tar cfz $TEST_ROOT/flake.tar.gz -C $TEST_ROOT flake5
 
 nix build -o $TEST_ROOT/result file://$TEST_ROOT/flake.tar.gz