1 files changed, 4 insertions, 0 deletions
diff --git a/js/headers.ts b/js/headers.ts
index dcb5f4c6a..2f15f14da 100644
--- a/js/headers.ts
+++ b/js/headers.ts
@@ -125,6 +125,10 @@ class HeadersBase {
     this._validateValue(newvalue);
     this[headerMap].set(newname, newvalue);
   }
+
+  get [Symbol.toStringTag](): string {
+    return "Headers";
+  }
 }
 
 // @internal