diff --git a/src/_shims/fetch.d.ts b/src/_shims/fetch.d.ts
index 79dcf074c..772a6d987 100644
--- a/src/_shims/fetch.d.ts
+++ b/src/_shims/fetch.d.ts
@@ -56,4 +56,5 @@ export type {
   _RequestInfo as RequestInfo,
   _ResponseType as ResponseType,
   _BodyInit as BodyInit,
+  _HeadersInit as HeadersInit,
 };
diff --git a/src/_shims/fetch.node.d.ts b/src/_shims/fetch.node.d.ts
index 4a1bf5051..006f00da4 100644
--- a/src/_shims/fetch.node.d.ts
+++ b/src/_shims/fetch.node.d.ts
@@ -60,4 +60,5 @@ export type {
   _RequestInfo as RequestInfo,
   _ResponseType as ResponseType,
   _BodyInit as BodyInit,
+  _HeadersInit as HeadersInit,
 };