diff --git a/drivers/tty/serial/m32r_sio.h b/drivers/tty/serial/m32r_sio.h
index e9b7e11..8129824 100644
--- a/drivers/tty/serial/m32r_sio.h
+++ b/drivers/tty/serial/m32r_sio.h
@@ -15,6 +15,7 @@
  * (at your option) any later version.
  */
 
+#include <linux/pci.h>
 
 struct m32r_sio_probe {
 	struct module	*owner;