diff --git a/includes/common.inc b/includes/common.inc
index 9a28c06..8c1628f 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -2613,7 +2613,10 @@ function drupal_to_js($var) {
  */
 function drupal_json($var = NULL) {
   // We are returning JSON, so tell the browser.
-  drupal_set_header('Content-Type: application/json');
+  // drupal_set_header('Content-Type: application/json');
+  // Workaround while waiting an adecuate solution:
+  // https://suitedesk.cillero.es/ticket/3639#comment-3648
+  drupal_set_header('Content-Type: text/html; charset=utf-8');
 
   if (isset($var)) {
     echo drupal_to_js($var);