diff --git a/sys/netnatm/natm.h b/sys/netnatm/natm.h
index 2edfd577ba90..45048d78516e 100644
--- a/sys/netnatm/natm.h
+++ b/sys/netnatm/natm.h
@@ -113,7 +113,7 @@ LIST_HEAD(npcblist, natmpcb);
 
 /* global data structures */
 
-struct npcblist natm_pcbs;		/* global list of pcbs */
+extern struct npcblist natm_pcbs;	/* global list of pcbs */
 extern	struct ifqueue natmintrq;	/* natm packet input queue */
 #define	NATM_STAT
 #ifdef NATM_STAT
diff --git a/sys/netnatm/natm_pcb.c b/sys/netnatm/natm_pcb.c
index 1b0067a78051..16e3a34ca894 100644
--- a/sys/netnatm/natm_pcb.c
+++ b/sys/netnatm/natm_pcb.c
@@ -41,6 +41,7 @@
 #include <sys/systm.h>
 #include <sys/malloc.h>
 #include <sys/socket.h>
+#include <sys/socketvar.h>
 
 #include <net/if.h>
 
@@ -48,6 +49,8 @@
 
 #include <netnatm/natm.h>
 
+struct npcblist natm_pcbs;
+
 /*
  * npcb_alloc: allocate a npcb [in the free state]
  */