diff --git a/frontend-js/src/main/css/global.css b/frontend-js/src/main/css/global.css
index 32512ff5ae680ceb2ae6423693728d8b7f771183..ec96abdecc0f75b3837f87e961dc9ab06c5bf08a 100644
--- a/frontend-js/src/main/css/global.css
+++ b/frontend-js/src/main/css/global.css
@@ -492,6 +492,10 @@ h1 {
 	margin: 5px;
 }
 
+.minerva-no-close .ui-dialog-titlebar-close {
+	display: none
+}
+
 .ui-icon {
 	display: inline-block;
 }
diff --git a/frontend-js/src/main/js/GuiConnector.js b/frontend-js/src/main/js/GuiConnector.js
index 771de8f22f895ffa627b2ad80fa9ff8b175586d3..3fd610d52c8f7bc600106464ccab544a82918b6d 100644
--- a/frontend-js/src/main/js/GuiConnector.js
+++ b/frontend-js/src/main/js/GuiConnector.js
@@ -132,10 +132,7 @@ GuiConnector.showProcessing = function(messageText) {
       title : "PROCESSING",
       width : "150px",
       closeOnEscape : false,
-      open : function(event, ui) {
-        /*jslint bitwise: true */
-        $(".ui-dialog-titlebar-close", ui.dialog | ui).hide();
-      },
+      dialogClass: 'minerva-no-close',
     });
   }
   if (messageText === undefined) {