diff --git a/scripts/pi-hole/js/groups-common.js b/scripts/pi-hole/js/groups-common.js
index 653b72cf..86e84524 100644
--- a/scripts/pi-hole/js/groups-common.js
+++ b/scripts/pi-hole/js/groups-common.js
@@ -66,6 +66,7 @@ function delGroupItems(type, ids, table) {
   $.ajax({
     url: url,
     data: JSON.stringify(ids),
+    contentType: "application/json",
     method: "POST",
   })
     .done(function () {