diff --git a/config.h.in b/config.h.in
index d16a997..8088a2a 100644
--- a/config.h.in
+++ b/config.h.in
@@ -27,7 +27,7 @@
 #define TPM_STORAGE_NAME "${TPM_STORAGE_NAME}"
 #define TPM_DEVICE_NAME  "${TPM_DEVICE_NAME}"
 #define TPM_LOG_FILE     "${TPM_LOG_FILE}"
-#define TPM_CMD_BUF_SIZE 4096
+#define TPM_CMD_BUF_SIZE 4088
 
 #endif /* _CONFIG_H_ */
 
