diff --git a/packages/backend/src/apps/gmail/auth/refresh-token.js b/packages/backend/src/apps/gmail/auth/refresh-token.js
index 7c5b7020..2c137caa 100644
--- a/packages/backend/src/apps/gmail/auth/refresh-token.js
+++ b/packages/backend/src/apps/gmail/auth/refresh-token.js
@@ -12,7 +12,12 @@ const refreshToken = async ($) => {
 
   const { data } = await $.http.post(
     'https://oauth2.googleapis.com/token',
-    params.toString()
+    params.toString(),
+    {
+      additionalProperties: {
+        skipAddingAuthHeader: true,
+      },
+    }
   );
 
   await $.auth.set({
diff --git a/packages/backend/src/apps/gmail/common/add-auth-header.js b/packages/backend/src/apps/gmail/common/add-auth-header.js
index 02477aa4..f957ebf9 100644
--- a/packages/backend/src/apps/gmail/common/add-auth-header.js
+++ b/packages/backend/src/apps/gmail/common/add-auth-header.js
@@ -1,5 +1,8 @@
 const addAuthHeader = ($, requestConfig) => {
-  if ($.auth.data?.accessToken) {
+  if (
+    !requestConfig.additionalProperties?.skipAddingAuthHeader &&
+    $.auth.data?.accessToken
+  ) {
     requestConfig.headers.Authorization = `${$.auth.data.tokenType} ${$.auth.data.accessToken}`;
   }