diff --git a/fthd_drv.h b/fthd_drv.h
index c6eae90..3e4f768 100644
--- a/fthd_drv.h
+++ b/fthd_drv.h
@@ -35,8 +35,6 @@
 #define FTHD_PCI_S2_MEM 2
 #define FTHD_PCI_ISP_IO 4
 
-#define MAX(a, b) ((a)>(b)?(a):(b))
-
 #define FTHD_BUFFERS 4
 
 struct fthd_reg {
diff --git a/fthd_isp.c b/fthd_isp.c
index 7a5c414..4f98790 100644
--- a/fthd_isp.c
+++ b/fthd_isp.c
@@ -17,6 +17,7 @@
  *
  */
 
+#include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/acpi.h>
 #include <linux/firmware.h>
@@ -276,7 +277,7 @@ static int fthd_isp_cmd(struct fthd_private *dev_priv, enum fthd_isp_cmds comman
 	memset(&cmd, 0, sizeof(cmd));
 
 	if (response_len) {
-		len = MAX(request_len, *response_len);
+		len = max(request_len, *response_len);
 	} else {
 		len = request_len;
 	}