diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index fd3a4beaa53d941adcc4d0bfab0932354fa0b8d2..dec0224b4478803c566cb932ae81da22d1d00bed 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -24,6 +24,7 @@
 #include <linux/fs.h>
 #include <linux/miscdevice.h>
 #include <linux/platform_device.h>
+#include <linux/io.h>
 
 enum tpm_timeout {
 	TPM_TIMEOUT = 5,	/* msecs */