diff --git a/include/vault.h b/include/vault.h
new file mode 100644
index 000000000..d6db11663
--- /dev/null
+++ b/include/vault.h
@@ -0,0 +1,27 @@
+/*	SCCS Id: @(#)vault.h	3.3	97/05/01	*/
+/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
+/* NetHack may be freely redistributed.  See license for details. */
+
+#ifndef VAULT_H
+#define VAULT_H
+
+#define FCSIZ	(ROWNO+COLNO)
+struct fakecorridor {
+	xchar fx,fy,ftyp;
+};
+
+struct egd {
+	int fcbeg, fcend;	/* fcend: first unused pos */
+	int vroom;		/* room number of the vault */
+	xchar gdx, gdy;		/* goal of guard's walk */
+	xchar ogx, ogy;		/* guard's last position */
+	d_level gdlevel;	/* level (& dungeon) guard was created in */
+	xchar warncnt;		/* number of warnings to follow */
+	Bitfield(gddone,1);	/* true iff guard has released player */
+	Bitfield(unused,7);
+	struct fakecorridor fakecorr[FCSIZ];
+};
+
+#define EGD(mon)	((struct egd *)&(mon)->mextra[0])
+
+#endif /* VAULT_H */