diff --git a/include/ldap_pvt.h b/include/ldap_pvt.h
index 88e1ee0edf..bf12eea29a 100644
--- a/include/ldap_pvt.h
+++ b/include/ldap_pvt.h
@@ -82,7 +82,7 @@ ldap_pvt_get_hname LDAP_P((
 LDAP_F( int )
 ldap_charray_add LDAP_P((
     char	***a,
-    char	*s ));
+    const char *s ));
 
 LDAP_F( int )
 ldap_charray_merge LDAP_P((
@@ -95,7 +95,7 @@ ldap_charray_free LDAP_P(( char **a ));
 LDAP_F( int )
 ldap_charray_inlist LDAP_P((
     char	**a,
-    char	*s ));
+    const char *s ));
 
 LDAP_F( char ** )
 ldap_charray_dup LDAP_P(( char **a ));
diff --git a/libraries/libldap/charray.c b/libraries/libldap/charray.c
index ad5c4c8b3b..b851f002d6 100644
--- a/libraries/libldap/charray.c
+++ b/libraries/libldap/charray.c
@@ -17,7 +17,7 @@
 int
 ldap_charray_add(
     char	***a,
-    char	*s
+    const char *s
 )
 {
 	int	n;
@@ -120,7 +120,7 @@ ldap_charray_free( char **a )
 int
 ldap_charray_inlist(
     char	**a,
-    char	*s
+    const char *s
 )
 {
 	int	i;