diff --git a/vncviewer/win32.h b/vncviewer/win32.h
index 35be77b..0148708 100644
--- a/vncviewer/win32.h
+++ b/vncviewer/win32.h
@@ -30,6 +30,8 @@
 int win32_enable_lowlevel_keyboard(HWND hwnd);
 void win32_disable_lowlevel_keyboard(HWND hwnd);
 
+int win32_vkey_to_keysym(UINT vkey, int extended);
+
 };
 
 #endif