diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index b0603b2e56844e38e1e4082eaf20ed115d78b07e..f4c68abf2a15012a90a26a0fd309fac4d84c3cb8 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -31,7 +31,7 @@
 
 enum tpm_const {
 	TPM_MINOR = 224,	/* officially assigned */
-	TPM_BUFSIZE = 2048,
+	TPM_BUFSIZE = 4096,
 	TPM_NUM_DEVICES = 256,
 };