diff --git a/src/libCom/misc/gsd_sync_defs.h b/src/libCom/misc/gsd_sync_defs.h
deleted file mode 100644
index f3b7ef86b..000000000
--- a/src/libCom/misc/gsd_sync_defs.h
+++ /dev/null
@@ -1,38 +0,0 @@
-/*************************************************************************\
-* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
-*     National Laboratory.
-* Copyright (c) 2002 The Regents of the University of California, as
-*     Operator of Los Alamos National Laboratory.
-* EPICS BASE Versions 3.13.7
-* and higher are distributed subject to a Software License Agreement found
-* in file LICENSE that is included with this distribution. 
-\*************************************************************************/
-#ifndef INCgsd_sync_defsh
-#define INCgsd_sync_defsh
-/*	$Id$
- *	Author:	Gale Slentz
- *	Date:	09-18-90
- */
-/*+/mod***********************************************************************
-* TITLE	gsd_sync_defs.h - defines for gsd_sync.c
-*
-* DESCRIPTION
-*	Contains the definitions that a user of gsd_sync.c
-*	(for silo of synchronous data) would need to use.
-*
-*-***************************************************************************/
-#define	PREVIOUS_SYNC_DATA	0
-#define	NEXTSET_SYNC_DATA	1
-#define USEC_TIME_OUT		100	/* struct timeval's timeout 100usecs */
-#define VOID			void
-
-struct gsd_sync_data {
-	char *pName;	/* ptr to channel name string */
-	chid pChid;	/* Channel Access id */
-	chtype time_type;	/* DBR_TIME_xxxx type specifier for data */
-	int count;	/* element count */
-	int svalid;	/* valid data flag */
-	VOID *pSdata;	/* ptr to DBR_TIME_XXXX structure */
-};
-
-#endif /* INCgsd_sync_defsh */