diff --git a/pkgs/by-name/st/stalwart-mail/package.nix b/pkgs/by-name/st/stalwart-mail/package.nix
index 5c7fec29e037..3fffbafd32bb 100644
--- a/pkgs/by-name/st/stalwart-mail/package.nix
+++ b/pkgs/by-name/st/stalwart-mail/package.nix
@@ -148,7 +148,7 @@ rustPlatform.buildRustPackage {
 
   passthru = {
     webadmin = callPackage ./webadmin.nix { };
-    update-script = nix-update-script { };
+    updateScript = nix-update-script { };
     tests.stalwart-mail = nixosTests.stalwart-mail;
   };