diff --git a/src/scripts/cores/oauth2.js b/src/scripts/cores/oauth2.js
index 8fc377b..74985d6 100644
--- a/src/scripts/cores/oauth2.js
+++ b/src/scripts/cores/oauth2.js
@@ -455,7 +455,7 @@ $(function () {
         data['scope'] = params.scope;
       }
       ajaxOption['data'] = data;
-      ajaxOption['contentType'] = 'Content-Type: application/x-www-form-urlencoded';
+      ajaxOption['contentType'] = 'application/x-www-form-urlencoded';
     }
     console.log(`[oauth2.js][obtain-access-token] ajaxOption`, ajaxOption);
     
@@ -647,4 +647,4 @@ function oauth2Sign(request) {
     request.url = Misc.insertParam(request.url, { 'access_token': request.authentication.data.result.access_token });
   }
   return request;
-}
\ No newline at end of file
+}