diff --git a/apps/server/src/checkpointing/Layers/CheckpointDiffQuery.ts b/apps/server/src/checkpointing/Layers/CheckpointDiffQuery.ts
index 5cf26c86da..bbb5a42931 100644
--- a/apps/server/src/checkpointing/Layers/CheckpointDiffQuery.ts
+++ b/apps/server/src/checkpointing/Layers/CheckpointDiffQuery.ts
@@ -21,8 +21,8 @@ const make = Effect.gen(function* () {
   const projectionSnapshotQuery = yield* ProjectionSnapshotQuery;
   const checkpointStore = yield* CheckpointStore;
 
-  const getTurnDiff: CheckpointDiffQueryShape["getTurnDiff"] = (input) =>
-    Effect.gen(function* () {
+  const getTurnDiff: CheckpointDiffQueryShape["getTurnDiff"] = Effect.fn("getTurnDiff")(
+    function* (input) {
       const operation = "CheckpointDiffQuery.getTurnDiff";
 
       if (input.fromTurnCount === input.toTurnCount) {
@@ -149,7 +149,8 @@ const make = Effect.gen(function* () {
       }
 
       return turnDiff;
-    });
+    },
+  );
 
   const getFullThreadDiff: CheckpointDiffQueryShape["getFullThreadDiff"] = (
     input: OrchestrationGetFullThreadDiffInput,