diff --git a/packages/testkit/src/journeys.test.ts b/packages/testkit/src/journeys.test.ts
index f236434..3ab5e55 100644
--- a/packages/testkit/src/journeys.test.ts
+++ b/packages/testkit/src/journeys.test.ts
@@ -1305,8 +1305,9 @@ describeJourneys("required product journeys", () => {
     });
 
     await joinMainConversation(prisma, { userId: me.userId, botIds: [writer.id] });
+    // Lab has a main conversation of its own; the home one is where Writer joined.
     const conversation = await prisma.chatGroup.findFirstOrThrow({
-      where: { userId: me.userId, kind: "main" },
+      where: { userId: me.userId, spaceId: main.spaceId, kind: "main" },
       include: { thread: true },
     });
     const inMain = await scheduleAndWake("Writer", "main-digest");