diff --git a/shell.nix b/shell.nix
index b3f092b22..699d0b2ec 100644
--- a/shell.nix
+++ b/shell.nix
@@ -273,7 +273,7 @@ in pkgs.mkShell {
   '';
   nativeBuildInputs = [develop inDevelop killallUni2work diffRunning]
   ++ (with pkgs;
-    [ stack nodejs_21 postgresql_12 openldap exiftool memcached minio minio-client
+    [ stack nodejs_21 postgresql_12 openldap exiftool expat memcached minio minio-client
       gup reuse pre-commit
       # node2nix
       # busybox # for print services, but interferes with build commands in develop-shell