diff --git a/test/types/fetch.test-d.ts b/test/types/fetch.test-d.ts
index 59fb49fc3e8..b06e50ac480 100644
--- a/test/types/fetch.test-d.ts
+++ b/test/types/fetch.test-d.ts
@@ -31,6 +31,7 @@ const requestInit2: RequestInit = {
 const requestInit3: RequestInit = {}
 // Test assignment. See https://github.com/whatwg/fetch/issues/1445
 requestInit3.credentials = 'include'
+const requestInit4: RequestInit = { body: null }
 
 declare const request: Request
 declare const headers: Headers
diff --git a/types/fetch.d.ts b/types/fetch.d.ts
index 68779da13ba..d51311b13df 100644
--- a/types/fetch.d.ts
+++ b/types/fetch.d.ts
@@ -122,7 +122,7 @@ export interface RequestInit {
   method?: string
   keepalive?: boolean
   headers?: HeadersInit
-  body?: BodyInit
+  body?: BodyInit | null
   redirect?: RequestRedirect
   integrity?: string
   signal?: AbortSignal | null