diff --git a/src/addons/calendar/components/filter/filter.ts b/src/addons/calendar/components/filter/filter.ts
index c13e6e372..8c1330e68 100644
--- a/src/addons/calendar/components/filter/filter.ts
+++ b/src/addons/calendar/components/filter/filter.ts
@@ -19,6 +19,7 @@ import { ModalController } from '@singletons';
 import { CoreEvents } from '@singletons/events';
 import { AddonCalendarEventType, AddonCalendarProvider } from '../../services/calendar';
 import { AddonCalendarFilter, AddonCalendarEventIcons } from '../../services/calendar-helper';
+import { ALL_COURSES_ID } from '@features/courses/services/courses-helper';
 
 /**
  * Component to display the events filter that includes events types and a list of courses.
@@ -30,7 +31,7 @@ import { AddonCalendarFilter, AddonCalendarEventIcons } from '../../services/cal
 })
 export class AddonCalendarFilterComponent implements OnInit {
 
-    @Input() courses: Partial<CoreEnrolledCourseData>[] = [];
+    @Input() courses: CoreEnrolledCourseData[] = [];
     @Input() filter: AddonCalendarFilter = {
         filtered: false,
         courseId: undefined,
@@ -45,7 +46,7 @@ export class AddonCalendarFilterComponent implements OnInit {
     courseId = -1;
     typeIcons: AddonCalendarEventIcons[] = [];
     types: string[] = [];
-    sortedCourses: Partial<CoreEnrolledCourseData>[] = [];
+    sortedCourses: CoreEnrolledCourseData[] = [];
 
     constructor() {
         CoreUtils.enumKeys(AddonCalendarEventType).forEach((name) => {
@@ -60,10 +61,18 @@ export class AddonCalendarFilterComponent implements OnInit {
      * @inheritdoc
      */
     ngOnInit(): void {
-        this.courseId = this.filter.courseId || -1;
+        this.courseId = this.filter.courseId || ALL_COURSES_ID;
+        this.sortedCourses = Array.from(this.courses).sort((a, b) => {
+            if (a.id === ALL_COURSES_ID) {
+                return -1;
+            }
 
-        this.sortedCourses = Array.from(this.courses)
-            .sort((a, b) => (a.shortname?.toLowerCase() ?? '').localeCompare(b.shortname?.toLowerCase() ?? ''));
+            if (b.id === ALL_COURSES_ID) {
+                return 1;
+            }
+
+            return (a.shortname?.toLowerCase() ?? '').localeCompare(b.shortname?.toLowerCase() ?? '');
+        });
     }
 
     /**
diff --git a/src/addons/calendar/pages/day/day.ts b/src/addons/calendar/pages/day/day.ts
index 9a84da8f1..4ad52ea63 100644
--- a/src/addons/calendar/pages/day/day.ts
+++ b/src/addons/calendar/pages/day/day.ts
@@ -489,7 +489,7 @@ type PreloadedDay = DayBasicData & CoreSwipeSlidesDynamicItem & {
  */
 class AddonCalendarDaySlidesItemsManagerSource extends CoreSwipeSlidesDynamicItemsManagerSource<PreloadedDay> {
 
-    courses: Partial<CoreEnrolledCourseData>[] = [];
+    courses: CoreEnrolledCourseData[] = [];
     eventsSources: Set<AddonCalendarEventsSource> = new Set();
     // Offline events classified in month & day.
     offlineEvents: Record<string, Record<number, AddonCalendarEventToDisplay[]>> = {};
diff --git a/src/addons/calendar/pages/index/index.ts b/src/addons/calendar/pages/index/index.ts
index 07e4545a8..cd48d82d1 100644
--- a/src/addons/calendar/pages/index/index.ts
+++ b/src/addons/calendar/pages/index/index.ts
@@ -62,7 +62,7 @@ export class AddonCalendarIndexPage implements OnInit, OnDestroy {
     year?: number;
     month?: number;
     canCreate = false;
-    courses: Partial<CoreEnrolledCourseData>[] = [];
+    courses: CoreEnrolledCourseData[] = [];
     loaded = false;
     hasOffline = false;
     isOnline = false;
diff --git a/src/core/features/courses/services/courses-helper.ts b/src/core/features/courses/services/courses-helper.ts
index 74a7b5640..b794816d0 100644
--- a/src/core/features/courses/services/courses-helper.ts
+++ b/src/core/features/courses/services/courses-helper.ts
@@ -31,6 +31,9 @@ import { firstValueFrom, zipIncludingComplete } from '@/core/utils/rxjs';
 import { catchError, map } from 'rxjs/operators';
 import { chainRequests, WSObservable } from '@classes/site';
 
+// Id for a course item representing all courses (for example, for course filters).
+export const ALL_COURSES_ID = -1;
+
 /**
  * Helper to gather some common courses functions.
  */
@@ -45,14 +48,17 @@ export class CoreCoursesHelperProvider {
      * @param courseId Course ID to get the category.
      * @returns Promise resolved with the list of courses and the category.
      */
-    async getCoursesForPopover(courseId?: number): Promise<{courses: Partial<CoreEnrolledCourseData>[]; categoryId?: number}> {
-        const courses: Partial<CoreEnrolledCourseData>[] = await CoreCourses.getUserCourses(false);
+    async getCoursesForPopover(courseId?: number): Promise<{courses: CoreEnrolledCourseData[]; categoryId?: number}> {
+        const courses: CoreEnrolledCourseData[] = await CoreCourses.getUserCourses(false);
 
         // Add "All courses".
         courses.unshift({
-            id: -1,
+            id: ALL_COURSES_ID,
             fullname: Translate.instant('core.fulllistofcourses'),
+            shortname: Translate.instant('core.fulllistofcourses'),
             categoryid: -1,
+            summary: '',
+            summaryformat: 1,
         });
 
         let categoryId: number | undefined;