diff --git a/include/hw/acpi/tpm.h b/include/hw/acpi/tpm.h
index 46ac4dc581..3580ffd50c 100644
--- a/include/hw/acpi/tpm.h
+++ b/include/hw/acpi/tpm.h
@@ -16,6 +16,7 @@
 #ifndef HW_ACPI_TPM_H
 #define HW_ACPI_TPM_H
 
+#include "qemu/units.h"
 #include "hw/registerfields.h"
 
 #define TPM_TIS_ADDR_BASE           0xFED40000
@@ -176,7 +177,7 @@ REG32(CRB_DATA_BUFFER, 0x80)
 #define TPM_CRB_ADDR_CTRL           (TPM_CRB_ADDR_BASE + A_CRB_CTRL_REQ)
 #define TPM_CRB_R_MAX               R_CRB_DATA_BUFFER
 
-#define TPM_LOG_AREA_MINIMUM_SIZE   (64 * 1024)
+#define TPM_LOG_AREA_MINIMUM_SIZE   (64 * KiB)
 
 #define TPM_TCPA_ACPI_CLASS_CLIENT  0
 #define TPM_TCPA_ACPI_CLASS_SERVER  1