diff --git a/runtime/internal/rpc/stream/manager/error_test.go b/runtime/internal/rpc/stream/manager/error_test.go
index fe6f76d..1b72577 100644
--- a/runtime/internal/rpc/stream/manager/error_test.go
+++ b/runtime/internal/rpc/stream/manager/error_test.go
@@ -131,6 +131,7 @@
 	if err != nil {
 		t.Fatal(err)
 	}
+	defer ln.Close()
 
 	// Server will just listen for flows and close them.
 	go acceptLoop(ln)