diff --git a/codex-rs/mcp-types/tests/initialize.rs b/codex-rs/mcp-types/tests/initialize.rs
index 734e11f720..12e7f0f936 100644
--- a/codex-rs/mcp-types/tests/initialize.rs
+++ b/codex-rs/mcp-types/tests/initialize.rs
@@ -5,6 +5,7 @@ use mcp_types::InitializeRequestParams;
 use mcp_types::JSONRPCMessage;
 use mcp_types::JSONRPCRequest;
 use mcp_types::RequestId;
+use mcp_types::JSONRPC_VERSION;
 use serde_json::json;
 
 #[test]