diff --git a/src/adlist.c b/src/adlist.c
index f0a261b6..e87d25ce 100644
--- a/src/adlist.c
+++ b/src/adlist.c
@@ -357,6 +357,6 @@ void listJoin(list *l, list *o) {
     l->len += o->len;
 
     /* Setup other as an empty list. */
-    o->head = l->tail = NULL;
+    o->head = o->tail = NULL;
     o->len = 0;
 }