diff --git a/src/back/backlasses.h b/src/back/backlasses.h
index 7c28408..2b2ff74 100644
--- a/src/back/backlasses.h
+++ b/src/back/backlasses.h
@@ -19,6 +19,8 @@
 //#include <comip.h>
 #include <Winerror.h>
 
+class EndpointWidget;
+
 class EndpointCallback : public IAudioEndpointVolumeCallback {
  	
  public: