diff --git a/src/store/calendarObjectInstance.js b/src/store/calendarObjectInstance.js
index d43260af09..6ae4f7da03 100644
--- a/src/store/calendarObjectInstance.js
+++ b/src/store/calendarObjectInstance.js
@@ -332,6 +332,9 @@ const mutations = {
 			}
 		}
 
+		// Delete custom description properties
+		calendarObjectInstance.eventComponent.deleteAllProperties('X-ALT-DESC')
+
 		calendarObjectInstance.eventComponent.description = description
 		calendarObjectInstance.description = description
 	},