diff --git a/src/gui/osd_helpers.h b/src/gui/osd_helpers.h
index 1815b29de..e86b1df1b 100644
--- a/src/gui/osd_helpers.h
+++ b/src/gui/osd_helpers.h
@@ -26,6 +26,7 @@ class COsdHelpers : public sigc::trackable
 		uint32_t getOsdResolution();
 		int setVideoSystem(int newSystem, bool remember = true);
 		sigc::signal<void> OnAfterChangeResolution;
+		sigc::signal<void> OnBeforeChangeResolution;
 };