diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c
--- a/sys/kern/vfs_cache.c
+++ b/sys/kern/vfs_cache.c
@@ -599,6 +599,7 @@
 
 /* Export size information to userland */
 SYSCTL_SIZEOF_STRUCT(namecache);
+SYSCTL_SIZEOF_STRUCT(namecache_ts);
 
 /*
  * The new name cache statistics