diff --git a/lib/krb5/kuserok.c b/lib/krb5/kuserok.c
index bedcf93af..9cbfb64b8 100644
--- a/lib/krb5/kuserok.c
+++ b/lib/krb5/kuserok.c
@@ -214,7 +214,7 @@ krb5_kuserok (krb5_context context,
 
     krb5_boolean found_file = FALSE;
 
-#ifdef HAVE_GETPWNAM_R
+#ifdef POSIX_GETPWNAM_R
     char pwbuf[2048];
     struct passwd pw;