diff --git a/src/include/dlfcn.h b/src/include/dlfcn.h
index dfa877a1..eff13c9f 100644
--- a/src/include/dlfcn.h
+++ b/src/include/dlfcn.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dlfcn.h,v 1.2 1997/09/21 10:45:32 niklas Exp $	*/
+/*	$OpenBSD: dlfcn.h,v 1.3 1999/12/09 18:10:23 espie Exp $	*/
 /*	$NetBSD: dlfcn.h,v 1.2 1995/06/05 19:38:00 pk Exp $	*/
 
 /*
@@ -40,9 +40,9 @@
  * User interface to the run-time linker.
  */
 __BEGIN_DECLS
-extern void	*dlopen __P((char *, int));
+extern void	*dlopen __P((const char *, int));
 extern int	dlclose __P((void *));
-extern void	*dlsym __P((void *, char *));
+extern void	*dlsym __P((void *, const char *));
 extern int	dlctl __P((void *, int, void *));
 extern char	*dlerror __P((void));
 __END_DECLS
diff --git a/src/include/link.h b/src/include/link.h
index 3c9893a8..fad8bb51 100644
--- a/src/include/link.h
+++ b/src/include/link.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: link.h,v 1.4 1999/05/18 15:50:09 espie Exp $	*/
+/*	$OpenBSD: link.h,v 1.5 1999/12/09 18:10:23 espie Exp $	*/
 /*	$NetBSD: link.h,v 1.10 1996/01/09 00:00:11 pk Exp $	*/
 
 /*
@@ -167,9 +167,9 @@ struct so_debug {
  * Entry points into ld.so - user interface to the run-time linker.
  */
 struct ld_entry {
-	void	*(*dlopen) __P((char *, int));
+	void	*(*dlopen) __P((const char *, int));
 	int	(*dlclose) __P((void *));
-	void	*(*dlsym) __P((void *, char *));
+	void	*(*dlsym) __P((void *, const char *));
 	int	(*dlctl) __P((void *, int, void *));
 	void	(*dlexit) __P((void));
 	void	(*dlrsrvd[3]) __P((void));