diff --git a/libc/include/unistd.h b/libc/include/unistd.h
new file mode 100644
index 000000000..b71e1f41e
--- /dev/null
+++ b/libc/include/unistd.h
@@ -0,0 +1,5 @@
+#pragma once
+
+#define STDIN_FILENO 0
+#define STDOUT_FILENO 1
+#define STDERR_FILENO 2