1 files changed, 1 insertions, 1 deletions
diff --git a/std/http/cookie.ts b/std/http/cookie.ts
index 5e4f38a29..10c9bd689 100644
--- a/std/http/cookie.ts
+++ b/std/http/cookie.ts
@@ -45,7 +45,7 @@ function toString(cookie: Cookie): string {
   if (cookie.httpOnly) {
     out.push("HttpOnly");
   }
-  if (Number.isInteger(cookie.maxAge)) {
+  if (typeof cookie.maxAge === "number" && Number.isInteger(cookie.maxAge)) {
     assert(cookie.maxAge > 0, "Max-Age must be an integer superior to 0");
     out.push(`Max-Age=${cookie.maxAge}`);
   }