diff --git a/src/client/inputhandler.h b/src/client/inputhandler.h
index b3a7d4ba3..365263b39 100644
--- a/src/client/inputhandler.h
+++ b/src/client/inputhandler.h
@@ -30,6 +30,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #endif
 
 class InputHandler;
+class TouchScreenGUI;
 
 /****************************************************************************
  Fast key cache for main game loop