diff --git a/lib/isc/pthreads/condition.c b/lib/isc/pthreads/condition.c
index 3f1c60a5ea..7682be6e51 100644
--- a/lib/isc/pthreads/condition.c
+++ b/lib/isc/pthreads/condition.c
@@ -6,14 +6,16 @@ boolean_t
 os_condition_waituntil(os_condition_t *c, os_mutex_t *m, os_time_t *t,
 		       boolean_t *timeout)
 {
+	int result;
 	struct timespec ts;
 
 	ts.tv_sec = t->seconds;
 	ts.tv_nsec = t->nanoseconds;
-	if (pthread_cond_timedwait(c, m, &ts) == 0) {
+	result = pthread_cond_timedwait(c, m, &ts);
+	if (result == 0) {
 		*timeout = FALSE;
 		return (TRUE);
-	} else if (errno == ETIMEDOUT) {
+	} else if (result == ETIMEDOUT) {
 		*timeout = TRUE;
 		return (TRUE);
 	}