diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 0770d1d..4334232 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -272,7 +272,6 @@
 	struct	tpm_output_header out;
 } tpm_cmd_header;
 
-#define TPM_DIGEST_SIZE 20
 struct tpm_pcrread_out {
 	u8	pcr_result[TPM_DIGEST_SIZE];
 } __packed;
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index fcb627f..9a9051b 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -22,6 +22,8 @@
 #ifndef __LINUX_TPM_H__
 #define __LINUX_TPM_H__
 
+#define TPM_DIGEST_SIZE 20	/* Max TPM v1.2 PCR size */
+
 /*
  * Chip num is this value or a valid tpm idx
  */