diff --git a/src/frontend/main_window.h b/src/frontend/main_window.h
index 45560fc..790b492 100644
--- a/src/frontend/main_window.h
+++ b/src/frontend/main_window.h
@@ -7,7 +7,7 @@
 #include "selection_widget.h"
 #include "question_widget.h"
 #include "result_widget.h"
-#include "../shared/ibackend_service.h"
+#include "../shared/backend_interface.h"
 
 class MainWindow : public QMainWindow {
     Q_OBJECT