diff --git a/registry/stable-uid.nix b/registry/stable-uid.nix
index cb6faaf..bb29bd5 100644
--- a/registry/stable-uid.nix
+++ b/registry/stable-uid.nix
@@ -22,14 +22,10 @@ in
 
   type = lib.types.ints.positive;
 
-  validate = entries:
-    let
-      uidConflicts = duplicateUids entries;
-    in
-    [
-      {
-        assertion = uidConflicts == { };
-        message = "Stable UID allocations must be unique.";
-      }
-    ];
+  validate = entries: [
+    {
+      assertion = duplicateUids entries == { };
+      message = "Stable UID allocations must be unique.";
+    }
+  ];
 }