diff --git a/sys/include/tos.h b/sys/include/tos.h
deleted file mode 100644
index b6c4429..0000000
--- a/sys/include/tos.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
-
-typedef struct Tos Tos;
-
-struct Tos {
-	uint64_t	cyclefreq;	/* cycle clock frequency if there is one, 0 otherwise */
-	int64_t	kcycles;	/* cycles spent in kernel */
-	int64_t	pcycles;	/* cycles spent in process (kernel + user) */
-	uint32_t	pid;		/* might as well put the pid here */
-	uint32_t	clock;
-	/* scratch space for kernel use (e.g., mips fp delay-slot execution) */
-	uint32_t	kscr[4];
-
-	/*
-	 * Fields below are not available on Plan 9 kernels.
-	 */
-	int	nixtype;	/* role of the core we are running at */
-	int	core;		/* core we are running at */
-	/* top of stack is here */
-};
-
-extern Tos *_tos;