diff --git a/drivers/isdn/mISDN/hwchannel.c b/drivers/isdn/mISDN/hwchannel.c
index e8049be..307bd6e 100644
--- a/drivers/isdn/mISDN/hwchannel.c
+++ b/drivers/isdn/mISDN/hwchannel.c
@@ -15,6 +15,7 @@
  *
  */
 
+#include <linux/gfp.h>
 #include <linux/module.h>
 #include <linux/mISDNhw.h>