diff --git a/YACReader/main_window_viewer.cpp b/YACReader/main_window_viewer.cpp
index 2faaee1f..8f9e496f 100644
--- a/YACReader/main_window_viewer.cpp
+++ b/YACReader/main_window_viewer.cpp
@@ -858,7 +858,7 @@ void MainWindowViewer::open(QString path, ComicDB &comic, QList<ComicDB> &siblin
     optionsDialog->setFilters(currentComicDB.info.brightness, currentComicDB.info.contrast, currentComicDB.info.gamma);
 }
 
-void MainWindowViewer::open(QString path, qint64 comicId, qint64 libraryId, OpenComicSource source)
+void MainWindowViewer::open(QString path, qint64 comicId, qint64 libraryId, YACReader::OpenComicSource source)
 {
     currentDirectory = path;
 
diff --git a/YACReader/main_window_viewer.h b/YACReader/main_window_viewer.h
index f2edee90..2c83c054 100644
--- a/YACReader/main_window_viewer.h
+++ b/YACReader/main_window_viewer.h
@@ -35,7 +35,7 @@ class MainWindowViewer : public QMainWindow
 public slots:
     void open();
     void open(QString path, ComicDB &comic, QList<ComicDB> &siblings);
-    void open(QString path, qint64 comicId, qint64 libraryId, OpenComicSource source);
+    void open(QString path, qint64 comicId, qint64 libraryId, YACReader::OpenComicSource source);
     void openFolder();
     void openRecent();
     void openLatestComic();