diff --git a/.changeset/every-coats-decide.md b/.changeset/every-coats-decide.md
new file mode 100644
index 0000000..7c4ffb5
--- /dev/null
+++ b/.changeset/every-coats-decide.md
@@ -0,0 +1,5 @@
+---
+'fetch-nodeshim': patch
+---
+
+Set `Content-Length: 0` when `response.body` is `null` for `PATCH` as well
diff --git a/src/fetch.ts b/src/fetch.ts
index 601e46b..2825bbd 100644
--- a/src/fetch.ts
+++ b/src/fetch.ts
@@ -253,7 +253,10 @@ async function _fetch(
     if (requestBody.contentType)
       requestHeaders.set('Content-Type', requestBody.contentType);
 
-    if (requestBody.body == null && (method === 'POST' || method === 'PUT')) {
+    if (
+      requestBody.body == null &&
+      (method === 'POST' || method === 'PUT' || method === 'PATCH')
+    ) {
       requestHeaders.set('Content-Length', '0');
     } else if (requestBody.body != null && requestBody.contentLength != null) {
       requestHeaders.set('Content-Length', `${requestBody.contentLength}`);