diff --git a/sys/sys/ck.h b/sys/sys/ck.h
index b04fe67b476d..1dba51daf063 100644
--- a/sys/sys/ck.h
+++ b/sys/sys/ck.h
@@ -1,18 +1,20 @@
 /*
  * $FreeBSD$
  */
 #ifndef _SYS_CK_H_
 #define _SYS_CK_H_
 
 #ifdef _KERNEL
 #include <ck_queue.h>
 #include <ck_epoch.h>
 #else
 #include <sys/queue.h>
 #define CK_STAILQ_HEAD STAILQ_HEAD
 #define CK_STAILQ_ENTRY STAILQ_ENTRY
 #define CK_LIST_HEAD LIST_HEAD
 #define CK_LIST_ENTRY LIST_ENTRY
+#define CK_SLIST_HEAD SLIST_HEAD
+#define CK_SLIST_ENTRY SLIST_ENTRY
 #endif
 
 #endif /* !_SYS_CK_H_ */