diff --git a/cli/test/e2e/prompt_test.go b/cli/test/e2e/prompt_test.go
index 93e97642..bbb7b1e0 100644
--- a/cli/test/e2e/prompt_test.go
+++ b/cli/test/e2e/prompt_test.go
@@ -344,8 +344,10 @@ func TestSubmissionCancellationRacesStartAndCompletion(t *testing.T) {
 	if cancelled.err != nil {
 		t.Fatal(cancelled.err)
 	}
+	// The target may have joined the first turn's next request before the
+	// cancellation lands; that turn is shared, so it is left running.
 	switch cancelled.outcome {
-	case "cancelled_queued", "interrupt_requested", "not_pending":
+	case "cancelled_queued", "interrupt_requested", "shared_running", "not_pending":
 	default:
 		t.Fatalf("unexpected racing cancellation outcome %q", cancelled.outcome)
 	}