diff --git a/pkgs/by-name/li/libjxl/package.nix b/pkgs/by-name/li/libjxl/package.nix
index 57f4ab170faf..6211023c59d8 100644
--- a/pkgs/by-name/li/libjxl/package.nix
+++ b/pkgs/by-name/li/libjxl/package.nix
@@ -126,10 +126,9 @@ stdenv.mkDerivation rec {
   postPatch = ''
     # Make sure we do not accidentally build against some of the vendored dependencies
     # If it asks you to "run deps.sh to fetch the build dependencies", then you are probably missing a JPEGXL_FORCE_SYSTEM_* flag
-    (
-      shopt -s extglob
-      rm -rf third_party/!(sjpeg)/
-    )
+    shopt -s extglob
+    rm -rf third_party/!(sjpeg)/
+    shopt -u extglob
 
     substituteInPlace plugins/gdk-pixbuf/jxl.thumbnailer \
       --replace '/usr/bin/gdk-pixbuf-thumbnailer' "$out/libexec/gdk-pixbuf-thumbnailer-jxl"