diff --git a/src/app/gui/components/service/service.component.ts b/src/app/gui/components/service/service.component.ts
index bff2d96..e0163d6 100644
--- a/src/app/gui/components/service/service.component.ts
+++ b/src/app/gui/components/service/service.component.ts
@@ -97,7 +97,7 @@ export class ServiceComponent implements OnInit {
     if (this.service.maintenance) {
       this.notifyNotLaunching(django.gettext('Service is in maintenance and cannot be launched'));
     } else if (this.service.not_accesible) {
-      const calendarDeniedText = this.service.custom_calendar_text || this.api.config.messages.calendarDenied;
+      const calendarDeniedText = this.service.custom_calendar_text || this.api.config.messages.calendar_denied;
 
       this.notifyNotLaunching(
         '<p align="center">' +
diff --git a/src/app/types/config.ts b/src/app/types/config.ts
index 9bf07cc..49221df 100644
--- a/src/app/types/config.ts
+++ b/src/app/types/config.ts
@@ -37,7 +37,7 @@ export interface UDSUrls {
 }
 
 export interface UDSMessages {
-    readonly calendarDenied: string;
+    readonly calendar_denied: string;
 }
 
 export interface MFAInfo {