diff --git a/libc/include/sys/sysmacros.h b/libc/include/sys/sysmacros.h
new file mode 100644
index 00000000..7d17574a
--- /dev/null
+++ b/libc/include/sys/sysmacros.h
@@ -0,0 +1,8 @@
+#pragma once
+
+#include <sys/types.h>
+
+#define makedev(maj, min) ((dev_t)(maj) << 32 | (dev_t)(min))
+
+#define major(dev) (((dev) >> 32) & 0xFFFFFFFF)
+#define minor(dev) ( (dev)        & 0xFFFFFFFF)