diff --git a/packages/bruno-electron/src/utils/collection.js b/packages/bruno-electron/src/utils/collection.js
index 82b37f43d..d6fed9da6 100644
--- a/packages/bruno-electron/src/utils/collection.js
+++ b/packages/bruno-electron/src/utils/collection.js
@@ -10,9 +10,10 @@ const mergeHeaders = (collection, request, requestTreePath) => {
   let collectionHeaders = get(collection, 'root.request.headers', []);
   collectionHeaders.forEach((header) => {
     if (header.enabled) {
-      headers.set(header.name?.toLowerCase?.(), header.value);
-      if (header?.name?.toLowerCase() === 'content-type') {
-        contentTypeDefined = true;
+      if (header?.name?.toLowerCase?.() === 'content-type') {
+        headers.set('content-type', header.value);
+      } else {
+        headers.set(header.name, header.value);
       }
     }
   });
@@ -22,14 +23,22 @@ const mergeHeaders = (collection, request, requestTreePath) => {
       let _headers = get(i, 'root.request.headers', []);
       _headers.forEach((header) => {
         if (header.enabled) {
-          headers.set(header.name?.toLowerCase?.(), header.value);
+          if (header.name.toLowerCase() === 'content-type') {
+            headers.set('content-type', header.value);
+          } else {
+            headers.set(header.name, header.value);
+          }
         }
       });
     } else {
       const _headers = i?.draft ? get(i, 'draft.request.headers', []) : get(i, 'request.headers', []);
       _headers.forEach((header) => {
         if (header.enabled) {
-          headers.set(header.name?.toLowerCase?.(), header.value);
+          if (header.name.toLowerCase() === 'content-type') {
+            headers.set('content-type', header.value);
+          } else {
+            headers.set(header.name, header.value);
+          }
         }
       });
     }