diff --git a/.changeset/mjwbenton.md b/.changeset/mjwbenton.md
new file mode 100644
index 000000000..48812d0d9
--- /dev/null
+++ b/.changeset/mjwbenton.md
@@ -0,0 +1,5 @@
+---
+"@opennextjs/aws": patch
+---
+
+fix content-length incorrectly set in proxyRequest
diff --git a/packages/open-next/src/core/routing/util.ts b/packages/open-next/src/core/routing/util.ts
index c7b25dd44..90cf025af 100644
--- a/packages/open-next/src/core/routing/util.ts
+++ b/packages/open-next/src/core/routing/util.ts
@@ -183,6 +183,7 @@ function filterHeadersForProxy(
     "x-cache",
     "transfer-encoding",
     "content-encoding",
+    "content-length",
   ];
   Object.entries(headers).forEach(([key, value]) => {
     const lowerKey = key.toLowerCase();