diff --git a/src/server/index.ts b/src/server/index.ts
index 5c2ba462..db5e36ad 100644
--- a/src/server/index.ts
+++ b/src/server/index.ts
@@ -449,7 +449,7 @@ export class Server<
     }
 
     let description: string | undefined;
-    if (rest[0] instanceof String) {
+    if (typeof rest[0] === "string") {
       description = rest.shift() as string;
     }