diff --git a/ansi/private/tty-raw-extension.c b/ansi/private/tty-raw-extension.c
index 5e613de..891b48a 100644
--- a/ansi/private/tty-raw-extension.c
+++ b/ansi/private/tty-raw-extension.c
@@ -67,7 +67,7 @@ Scheme_Object *scheme_reload(Scheme_Env *env) {
 }
 
 Scheme_Object *scheme_initialize(Scheme_Env *env) {
-  atexit(ttyrestore);
+  atexit((void (*)(void)) ttyrestore);
   return scheme_reload(env);
 }