diff --git a/.changeset/thick-feet-own.md b/.changeset/thick-feet-own.md
new file mode 100644
index 00000000000..51a5e641605
--- /dev/null
+++ b/.changeset/thick-feet-own.md
@@ -0,0 +1,5 @@
+---
+"@whatwg-node/node-fetch": patch
+---
+
+Send Content-Length:0 if the body is empty in POSTlike requests
diff --git a/packages/node-fetch/src/Request.ts b/packages/node-fetch/src/Request.ts
index 63e0e18d87a..0bc0e608c1d 100644
--- a/packages/node-fetch/src/Request.ts
+++ b/packages/node-fetch/src/Request.ts
@@ -81,6 +81,12 @@ export class PonyfillRequest<TJSON = any> extends PonyfillBody<TJSON> implements
       }
 
       const contentLengthInHeaders = this.headers.get('content-length');
+
+      if (this.body == null && !contentLengthInHeaders) {
+        this.contentLength = 0;
+        this.headers.set('content-length', '0');
+      }
+
       if (!contentLengthInHeaders) {
         if (this.contentLength) {
           this.headers.set('content-length', this.contentLength.toString());
diff --git a/packages/server/test/node.spec.ts b/packages/server/test/node.spec.ts
index d8311622dfb..5f1bfafbdad 100644
--- a/packages/server/test/node.spec.ts
+++ b/packages/server/test/node.spec.ts
@@ -202,6 +202,37 @@ describe('Node Specific Cases', () => {
         const resJson = await response.json();
         expect(resJson.contentLength).toBe('11');
       });
+
+      it('sends content-length correctly if body is nullish', async () => {
+        const serverAdapter = createServerAdapter(req => {
+          return Response.json({
+            contentLength: req.headers.get('content-length'),
+          });
+        });
+        testServer.addOnceHandler(serverAdapter);
+        const response = await fetch(testServer.url, {
+          method: 'POST',
+        });
+
+        const resJson = await response.json();
+        expect(resJson.contentLength).toBe('0');
+      });
+
+      it('sends content-length correctly if body is empty', async () => {
+        const serverAdapter = createServerAdapter(req => {
+          return Response.json({
+            contentLength: req.headers.get('content-length'),
+          });
+        });
+        testServer.addOnceHandler(serverAdapter);
+        const response = await fetch(testServer.url, {
+          method: 'POST',
+          body: '',
+        });
+
+        const resJson = await response.json();
+        expect(resJson.contentLength).toBe('0');
+      });
     });
   });
 });