diff --git a/Libraries/Network/XMLHttpRequestBase.js b/Libraries/Network/XMLHttpRequestBase.js
index f4d106b72aa45e..0621589e8376c6 100644
--- a/Libraries/Network/XMLHttpRequestBase.js
+++ b/Libraries/Network/XMLHttpRequestBase.js
@@ -154,7 +154,7 @@ class XMLHttpRequestBase {
     this._lowerCaseResponseHeaders =
       Object.keys(headers).reduce((lcaseHeaders, headerName) => {
         lcaseHeaders[headerName.toLowerCase()] = headers[headerName];
-        return headers;
+        return lcaseHeaders;
       }, {});
   }