diff --git a/src/addon/mod/data/providers/data.ts b/src/addon/mod/data/providers/data.ts
index cde86d294..0c4d01e23 100644
--- a/src/addon/mod/data/providers/data.ts
+++ b/src/addon/mod/data/providers/data.ts
@@ -947,7 +947,7 @@ export class AddonModDataProvider {
      * @param options Other options.
      * @return Promise resolved when the action is done.
      */
-    searchEntries(dataId: number, options?: AddonModDataSearchEntriesOptions): Promise<AddonModDataEntries> {
+    searchEntries(dataId: number, options: AddonModDataSearchEntriesOptions = {}): Promise<AddonModDataEntries> {
         options.groupId = options.groupId || 0;
         options.sort = options.sort || 0;
         options.order || options.order || 'DESC';
diff --git a/src/addon/mod/folder/providers/folder.ts b/src/addon/mod/folder/providers/folder.ts
index a75520c16..af356293f 100644
--- a/src/addon/mod/folder/providers/folder.ts
+++ b/src/addon/mod/folder/providers/folder.ts
@@ -57,7 +57,7 @@ export class AddonModFolderProvider {
      * @param options Other options.
      * @return Promise resolved when the book is retrieved.
      */
-    protected getFolderByKey(courseId: number, key: string, value: any, options?: CoreSitesCommonWSOptions)
+    protected getFolderByKey(courseId: number, key: string, value: any, options: CoreSitesCommonWSOptions = {})
             : Promise<AddonModFolderFolder> {
         return this.sitesProvider.getSite(options.siteId).then((site) => {
             const params = {