diff --git a/libc/include/utmp.h b/libc/include/utmp.h
index 7eeea41..c6f22a5 100644
--- a/libc/include/utmp.h
+++ b/libc/include/utmp.h
@@ -97,8 +97,9 @@
 __BEGIN_DECLS
 
 int utmpname(const char*);
-void setutent();
-struct utmp* getutent();
+void setutent(void);
+struct utmp* getutent(void);
+void endutent(void);
 
 int login_tty(int);