diff --git a/lib/linklist.h b/lib/linklist.h
index c8d715e..6209c8b 100644
--- a/lib/linklist.h
+++ b/lib/linklist.h
@@ -113,6 +113,7 @@
 #define LISTNODE_ATTACH(L,N) \
   do { \
     (N)->prev = (L)->tail; \
+    (N)->next = NULL; \
     if ((L)->head == NULL) \
       (L)->head = (N); \
     else \