diff --git a/lib/libc/gen/ttyname.c b/lib/libc/gen/ttyname.c
index 7593850a0c6..3c87d69239d 100644
--- a/lib/libc/gen/ttyname.c
+++ b/lib/libc/gen/ttyname.c
@@ -126,7 +126,7 @@ __ttyname_basic(int fd)
 	pthread_mutex_unlock(&ttyname_lock);
 
 	/* Must have thread specific data field to put data */
-	if (pthread_getspecific(ttyname_key, (void **) &buf) != 0) {
+	if ((buf = pthread_getspecific(ttyname_key)) != 0) {
 		return (NULL);
 	} else if (buf == NULL) {
 		if ((buf = malloc(sizeof(_PATH_DEV) + MAXNAMLEN)) != NULL) {