diff --git a/cont.c b/cont.c
index bf9f4415db..404c4cd04d 100644
--- a/cont.c
+++ b/cont.c
@@ -260,7 +260,7 @@ static ID fiber_initialize_keywords[2] = {0};
 /*
  * FreeBSD require a first (i.e. addr) argument of mmap(2) is not NULL
  * if MAP_STACK is passed.
- * http://www.FreeBSD.org/cgi/query-pr.cgi?pr=158755
+ * https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=158755
  */
 #if defined(MAP_STACK) && !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__)
 #define FIBER_STACK_FLAGS (MAP_PRIVATE | MAP_ANON | MAP_STACK)