diff --git a/libc/kernel/uapi/linux/ndctl.h b/libc/kernel/uapi/linux/ndctl.h
index 61c8929..53f8ba4 100644
--- a/libc/kernel/uapi/linux/ndctl.h
+++ b/libc/kernel/uapi/linux/ndctl.h
@@ -159,5 +159,9 @@
 #define NVDIMM_FAMILY_MSFT 3
 #define NVDIMM_FAMILY_HYPERV 4
 #define NVDIMM_FAMILY_PAPR 5
+#define NVDIMM_FAMILY_MAX NVDIMM_FAMILY_PAPR
+#define NVDIMM_BUS_FAMILY_NFIT 0
+#define NVDIMM_BUS_FAMILY_INTEL 1
+#define NVDIMM_BUS_FAMILY_MAX NVDIMM_BUS_FAMILY_INTEL
 #define ND_IOCTL_CALL _IOWR(ND_IOCTL, ND_CMD_CALL, struct nd_cmd_pkg)
 #endif