diff --git a/printf.c b/printf.c
index c9a1175..638275f 100644
--- a/printf.c
+++ b/printf.c
@@ -756,7 +756,7 @@ int fctprintf(void (*out)(char character, void* arg), void* arg, const char* for
   va_list va;
   va_start(va, format);
   const out_fct_wrap_type out_fct_wrap = { out, arg };
-  const int ret = _vsnprintf(_out_fct, (char*)&out_fct_wrap, (size_t)-1, format, va);
+  const int ret = _vsnprintf(_out_fct, (char*)(uintptr_t)&out_fct_wrap, (size_t)-1, format, va);
   va_end(va);
   return ret;
 }