diff --git a/src/build.sh b/src/build.sh
index ba4a73d..ecd7c6e 100644
--- a/src/build.sh
+++ b/src/build.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env nix-shell
-#! nix-shell -i bash --pure
+#! nix-shell -i bash
 #! nix-shell -p bash curl gcc zlib libffi icu77
 VERSION="140.4.0esr"
 DOWNLOAD="https://ftp.mozilla.org/pub/firefox/releases/$VERSION/source/firefox-$VERSION.source.tar.xz"