diff --git a/libc/kernel/uapi/linux/tee.h b/libc/kernel/uapi/linux/tee.h
index f23e000..5cfe713 100644
--- a/libc/kernel/uapi/linux/tee.h
+++ b/libc/kernel/uapi/linux/tee.h
@@ -28,6 +28,8 @@
 #define TEE_GEN_CAP_GP (1 << 0)
 #define TEE_GEN_CAP_PRIVILEGED (1 << 1)
 #define TEE_GEN_CAP_REG_MEM (1 << 2)
+#define TEE_GEN_CAP_MEMREF_NULL (1 << 3)
+#define TEE_MEMREF_NULL (__u64) (- 1)
 #define TEE_IMPL_ID_OPTEE 1
 #define TEE_IMPL_ID_AMDTEE 2
 #define TEE_OPTEE_CAP_TZ (1 << 0)