diff --git a/apps/extension/src/tools/__tests__/snapshot-coordinates.browser.test.ts b/apps/extension/src/tools/__tests__/snapshot-coordinates.browser.test.ts
index 1c1e190..686f23a 100644
--- a/apps/extension/src/tools/__tests__/snapshot-coordinates.browser.test.ts
+++ b/apps/extension/src/tools/__tests__/snapshot-coordinates.browser.test.ts
@@ -130,6 +130,7 @@ describe.skipIf(!process.env.BSK_GEOMETRY_CHROME)("real DOMSnapshot coordinate c
               return send(method, params, sessionFor(target));
             },
             getFrameGraph: async () => graph,
+            getAttachmentId: () => rootSession,
           };
           const oracles = new Map<string, Oracle>();
           for (const frame of frames) {