diff --git a/ext/posix/unistd.c b/ext/posix/unistd.c
index 9276640..69c8cef 100644
--- a/ext/posix/unistd.c
+++ b/ext/posix/unistd.c
@@ -525,6 +525,7 @@ Pgetgroups(lua_State *L)
 #endif
 
 
+#ifndef NO_GETLOGIN
 /***
 Current logged-in user.
 @treturn[1] string username, if successful
@@ -537,6 +538,7 @@ Pgetlogin(lua_State *L)
 	checknargs(L, 0);
 	return pushstringresult(getlogin());
 }
+#endif
 
 
 /***
@@ -1044,7 +1046,9 @@ static const luaL_Reg posix_unistd_fns[] =
 	LPOSIX_FUNC( Pgetegid		),
 	LPOSIX_FUNC( Pgeteuid		),
 	LPOSIX_FUNC( Pgetgid		),
+#ifndef NO_GETLOGIN
 	LPOSIX_FUNC( Pgetlogin		),
+#endif
 	LPOSIX_FUNC( Pgetpgrp		),
 	LPOSIX_FUNC( Pgetpid		),
 	LPOSIX_FUNC( Pgetppid		),