diff --git a/usr.bin/sdiff/Makefile b/usr.bin/sdiff/Makefile
index 504adc2a663e..f4772cc3da59 100644
--- a/usr.bin/sdiff/Makefile
+++ b/usr.bin/sdiff/Makefile
@@ -3,7 +3,7 @@
 .include <src.opts.mk>
 
 PROG=	sdiff
-SRCS=	common.c edit.c sdiff.c
+SRCS=	edit.c sdiff.c
 WARNS=	3
 
 MAN1=	sdiff.1
diff --git a/usr.bin/sdiff/common.c b/usr.bin/sdiff/common.c
deleted file mode 100644
index 686965c32b99..000000000000
--- a/usr.bin/sdiff/common.c
+++ /dev/null
@@ -1,24 +0,0 @@
-/*	$OpenBSD: common.c,v 1.4 2006/05/25 03:20:32 ray Exp $	*/
-
-/*
- * Written by Raymond Lai <ray@cyth.net>.
- * Public domain.
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include <err.h>
-#include <stdlib.h>
-#include <unistd.h>
-
-#include "common.h"
-
-void
-cleanup(const char *filename)
-{
-
-	if (unlink(filename))
-		err(2, "could not delete: %s", filename);
-	exit(2);
-}
diff --git a/usr.bin/sdiff/common.h b/usr.bin/sdiff/common.h
deleted file mode 100644
index 127c1f4b70f2..000000000000
--- a/usr.bin/sdiff/common.h
+++ /dev/null
@@ -1,9 +0,0 @@
-/*	$OpenBSD: common.h,v 1.2 2006/05/25 03:20:32 ray Exp $	*/
-/*	$FreeBSD$	*/
-
-/*
- * Written by Raymond Lai <ray@cyth.net>.
- * Public domain.
- */
-
-void cleanup(const char *) __dead2;
diff --git a/usr.bin/sdiff/edit.c b/usr.bin/sdiff/edit.c
index 7c01889d3551..993b515c49b5 100644
--- a/usr.bin/sdiff/edit.c
+++ b/usr.bin/sdiff/edit.c
@@ -21,9 +21,17 @@ __FBSDID("$FreeBSD$");
 #include <string.h>
 #include <unistd.h>
 
-#include "common.h"
 #include "extern.h"
 
+static void
+cleanup(const char *filename)
+{
+
+	if (unlink(filename))
+		err(2, "could not delete: %s", filename);
+	exit(2);
+}
+
 /*
  * Execute an editor on the specified pathname, which is interpreted
  * from the shell.  This means flags may be included.