--- ./drivers/dahdi/zaphfc.c.orig
+++ ./drivers/dahdi/zaphfc.c
@@ -27,6 +27,7 @@
 #include <linux/interrupt.h>
 #include <linux/delay.h>
 #include <linux/sched.h>
+#include <linux/vmalloc.h>
 #include <dahdi/kernel.h>
 #include "zaphfc.h"
 
