diff --git a/app/src/main/java/fr/free/nrw/commons/bookmarks/pictures/BookmarkPicturesController.java b/app/src/main/java/fr/free/nrw/commons/bookmarks/pictures/BookmarkPicturesController.java
deleted file mode 100644
index 7b644586c..000000000
--- a/app/src/main/java/fr/free/nrw/commons/bookmarks/pictures/BookmarkPicturesController.java
+++ /dev/null
@@ -1,63 +0,0 @@
-package fr.free.nrw.commons.bookmarks.pictures;
-
-import fr.free.nrw.commons.Media;
-import fr.free.nrw.commons.bookmarks.models.Bookmark;
-import fr.free.nrw.commons.media.MediaClient;
-import io.reactivex.Observable;
-import io.reactivex.ObservableSource;
-import io.reactivex.Single;
-import io.reactivex.functions.Function;
-import java.util.ArrayList;
-import java.util.List;
-import javax.inject.Inject;
-import javax.inject.Singleton;
-
-@Singleton
-public class BookmarkPicturesController {
-
-    private final MediaClient mediaClient;
-    private final BookmarkPicturesDao bookmarkDao;
-
-    private List<Bookmark> currentBookmarks;
-
-    @Inject
-    public BookmarkPicturesController(MediaClient mediaClient, BookmarkPicturesDao bookmarkDao) {
-        this.mediaClient = mediaClient;
-        this.bookmarkDao = bookmarkDao;
-        currentBookmarks = new ArrayList<>();
-    }
-
-    /**
-     * Loads the Media objects from the raw data stored in DB and the API.
-     * @return a list of bookmarked Media object
-     */
-    Single<List<Media>> loadBookmarkedPictures() {
-        List<Bookmark> bookmarks = bookmarkDao.getAllBookmarks();
-        currentBookmarks = bookmarks;
-        return Observable.fromIterable(bookmarks)
-                .flatMap((Function<Bookmark, ObservableSource<Media>>) this::getMediaFromBookmark)
-                .toList();
-    }
-
-    private Observable<Media> getMediaFromBookmark(Bookmark bookmark) {
-        return mediaClient.getMedia(bookmark.getMediaName())
-                .toObservable()
-            .onErrorResumeNext(Observable.empty());
-    }
-
-    /**
-     * Loads the Media objects from the raw data stored in DB and the API.
-     * @return a list of bookmarked Media object
-     */
-    boolean needRefreshBookmarkedPictures() {
-        List<Bookmark> bookmarks = bookmarkDao.getAllBookmarks();
-        return bookmarks.size() != currentBookmarks.size();
-    }
-
-    /**
-     * Cancels the requests to the API and the DB
-     */
-    void stop() {
-        //noop
-    }
-}
diff --git a/app/src/main/java/fr/free/nrw/commons/bookmarks/pictures/BookmarkPicturesController.kt b/app/src/main/java/fr/free/nrw/commons/bookmarks/pictures/BookmarkPicturesController.kt
new file mode 100644
index 000000000..5ee88d973
--- /dev/null
+++ b/app/src/main/java/fr/free/nrw/commons/bookmarks/pictures/BookmarkPicturesController.kt
@@ -0,0 +1,38 @@
+package fr.free.nrw.commons.bookmarks.pictures
+
+import fr.free.nrw.commons.Media
+import fr.free.nrw.commons.bookmarks.models.Bookmark
+import fr.free.nrw.commons.media.MediaClient
+import io.reactivex.Observable
+import io.reactivex.Single
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class BookmarkPicturesController @Inject constructor(
+    private val mediaClient: MediaClient,
+    private val bookmarkDao: BookmarkPicturesDao
+) {
+    private var currentBookmarks: List<Bookmark> = listOf()
+
+    /**
+     * Loads the Media objects from the raw data stored in DB and the API.
+     * @return a list of bookmarked Media object
+     */
+    fun loadBookmarkedPictures(): Single<List<Media>> {
+        val bookmarks = bookmarkDao.getAllBookmarks()
+        currentBookmarks = bookmarks
+        return Observable.fromIterable(bookmarks).flatMap {
+            mediaClient.getMedia(it.mediaName)
+                .toObservable()
+                .onErrorResumeNext(Observable.empty())
+        }.toList()
+    }
+
+    fun needRefreshBookmarkedPictures(): Boolean {
+        val bookmarks = bookmarkDao.getAllBookmarks()
+        return bookmarks.size != currentBookmarks.size
+    }
+
+    fun stop() = Unit
+}