1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/isdn/mISDN/stack.c b/drivers/isdn/mISDN/stack.c
index e2f45019ebf0..3e1532a180ff 100644
--- a/drivers/isdn/mISDN/stack.c
+++ b/drivers/isdn/mISDN/stack.c
@@ -17,6 +17,7 @@
 
 #include <linux/mISDNif.h>
 #include <linux/kthread.h>
+#include <linux/smp_lock.h>
 #include "core.h"
 
 static u_int    *debug;