--- source4/heimdal/lib/krb5/rd_req.c.orig	2017-03-11 18:25:05.000000000 +0100
+++ source4/heimdal/lib/krb5/rd_req.c	2017-03-11 18:25:47.000000000 +0100
@@ -441,7 +441,7 @@
 
 	krb5_timeofday (context, &now);
 
-	if (abs(ac->authenticator->ctime - now) > context->max_skew) {
+	if (labs(ac->authenticator->ctime - now) > context->max_skew) {
 	    ret = KRB5KRB_AP_ERR_SKEW;
 	    krb5_clear_error_message (context);
 	    goto out;