diff --git a/src/proto/os_win32.pro b/src/proto/os_win32.pro
index 7ea5388..cb84585 100644
--- a/src/proto/os_win32.pro
+++ b/src/proto/os_win32.pro
@@ -5,6 +5,7 @@
 HINSTANCE find_imported_module_by_funcname(HINSTANCE hInst, const char *funcname);
 void *get_dll_import_func(HINSTANCE hInst, const char *funcname);
 void *hook_dll_import_func(HINSTANCE hInst, const char *funcname, const void *hook);
+HINSTANCE get_forwarded_dll(HINSTANCE hInst);
 int dyn_libintl_init(void);
 void dyn_libintl_end(void);
 void PlatformId(void);