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);
 
diff --git a/tests/utmp_test.cpp b/tests/utmp_test.cpp
index b61110d..0fa55c7 100644
--- a/tests/utmp_test.cpp
+++ b/tests/utmp_test.cpp
@@ -23,3 +23,9 @@
   // This test just checks that we're exporting the symbol independently.
   ASSERT_EQ(-1, login_tty(-1));
 }
+
+TEST(utmp, setutent_getutent_endutent) {
+  setutent();
+  getutent();
+  endutent();
+}