diff --git a/frontend/less/espo/misc/fullcalendar/fullcalendar.less b/frontend/less/espo/misc/fullcalendar/fullcalendar.less
index b1e8f992fc..09e1831b4e 100644
--- a/frontend/less/espo/misc/fullcalendar/fullcalendar.less
+++ b/frontend/less/espo/misc/fullcalendar/fullcalendar.less
@@ -19,6 +19,10 @@
     height: 100% !important;
 }
 
+.calendar.fc {
+    user-select: none;
+}
+
 //-----
 
 @media screen and (max-width: (@screen-sm-min - 1px)) {