diff --git a/pkgs/build-support/fetchhg/nix-prefetch-hg b/pkgs/build-support/fetchhg/nix-prefetch-hg
index 55501f41bbe8..f1f648f4aeb8 100755
--- a/pkgs/build-support/fetchhg/nix-prefetch-hg
+++ b/pkgs/build-support/fetchhg/nix-prefetch-hg
@@ -49,6 +49,7 @@ if test -z "$finalPath"; then
       tmpClone=$url
     fi
     hg archive -q -y -r "$rev" --cwd $tmpClone $tmpArchive
+    rm -f $tmpArchive/.hg_archival.txt
 
 
     # Compute the hash.