diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8cc1783..0fef79e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## Version 1.12.12 - 2024-07-04
 
+### Fixed
+
+- Set `content-length` header correctly for OData V4 request in batch mode
+
 ### Added
 
 - CI Matrix Test Node 22
diff --git a/src/index.js b/src/index.js
index 7e82d32..c1928f8 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1368,6 +1368,14 @@ function cov2ap(options = {}) {
                 }
                 body = convertRequestBody(body, headers, url, req);
               }
+              if (body !== undefined) {
+                for (const name in headers) {
+                  if (name.toLowerCase() === "content-length") {
+                    headers[name] = Buffer.byteLength(body);
+                    break;
+                  }
+                }
+              }
               return { body, headers };
             },
             req.contentIdOrder,
diff --git a/test/_env/util/batch/Batch-POST.txt b/test/_env/util/batch/Batch-POST.txt
index 2d04d0e..ffc472e 100644
--- a/test/_env/util/batch/Batch-POST.txt
+++ b/test/_env/util/batch/Batch-POST.txt
@@ -4,8 +4,9 @@ Content-ID: 1
 
 POST Header HTTP/1.1
 Content-Type: application/json
+Content-Length: 39
 
-{"name":"Test – ABC"}
+{"name":"Test – ABC","__metadata":{}}
 --boundary
 Content-Type: application/http