diff --git a/src/server/stdio.ts b/src/server/stdio.ts
index 30c80012..fbbb9d75 100644
--- a/src/server/stdio.ts
+++ b/src/server/stdio.ts
@@ -1,3 +1,4 @@
+import type { Buffer } from "node:buffer";
 import process from "node:process";
 import { Readable, Writable } from "node:stream";
 import { ReadBuffer, serializeMessage } from "../shared/stdio.js";
diff --git a/src/shared/stdio.test.ts b/src/shared/stdio.test.ts
index b1227966..8e65857d 100644
--- a/src/shared/stdio.test.ts
+++ b/src/shared/stdio.test.ts
@@ -1,3 +1,4 @@
+import { Buffer } from "node:buffer";
 import { JSONRPCMessage } from "../types.js";
 import { ReadBuffer } from "./stdio.js";
 
diff --git a/src/shared/stdio.ts b/src/shared/stdio.ts
index 52bde646..ff320ffa 100644
--- a/src/shared/stdio.ts
+++ b/src/shared/stdio.ts
@@ -1,3 +1,4 @@
+import { Buffer } from "node:buffer";
 import { JSONRPCMessage, JSONRPCMessageSchema } from "../types.js";
 
 /**