diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index c63d0d1..f2cb750 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -15,6 +15,7 @@
  *Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
  */
 #include <linux/serial_reg.h>
+#include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/serial_core.h>