diff --git a/src/components/Editor/Invitees/InviteesList.vue b/src/components/Editor/Invitees/InviteesList.vue
index fa8367b284..a9a186a6f1 100644
--- a/src/components/Editor/Invitees/InviteesList.vue
+++ b/src/components/Editor/Invitees/InviteesList.vue
@@ -51,7 +51,7 @@
 
 			<NcButton v-if="!isReadOnly"
 				class="invitees-list-button-group__button"
-				:disabled="isListEmpty"
+				:disabled="isListEmpty || !isOrganizer"
 				@click="openFreeBusy">
 				{{ $t('calendar', 'Show busy times') }}
 			</NcButton>
@@ -128,6 +128,11 @@ export default {
 			return this.invitees
 				.filter(attendee => attendee.uri !== this.calendarObjectInstance.organizer.uri)
 		},
+		isOrganizer() {
+			return this.calendarObjectInstance.organizer !== null
+				&& this.$store.getters.getCurrentUserPrincipal !== null
+				&& removeMailtoPrefix(this.calendarObjectInstance.organizer.uri) === this.$store.getters.getCurrentUserPrincipal.emailAddress
+		},
 		hasOrganizer() {
 			return this.calendarObjectInstance.organizer !== null
 		},