diff --git a/servers/slapd/back-ldbm/proto-back-ldbm.h b/servers/slapd/back-ldbm/proto-back-ldbm.h
index a6ba91b729..5650befa2b 100644
--- a/servers/slapd/back-ldbm/proto-back-ldbm.h
+++ b/servers/slapd/back-ldbm/proto-back-ldbm.h
@@ -127,7 +127,7 @@ int index_add_values LDAP_P(( Backend *be, char *type, struct berval **vals, ID
 
 void ldbm_back_startup  LDAP_P(( Backend *be ));
 void ldbm_back_shutdown LDAP_P(( Backend *be ));
-void ldbm_db_errcall LDAP_P(( char *prefix, char *message ));
+void ldbm_db_errcall LDAP_P(( const char *prefix, char *message ));
 
 /*
  * nextid.c
diff --git a/servers/slapd/back-ldbm/startup.c b/servers/slapd/back-ldbm/startup.c
index e61144dc17..2b52a07ecc 100644
--- a/servers/slapd/back-ldbm/startup.c
+++ b/servers/slapd/back-ldbm/startup.c
@@ -87,7 +87,7 @@ ldbm_back_shutdown(
 #ifdef HAVE_BERKELEY_DB2
 
 void
-ldbm_db_errcall( char *prefix, char *message )
+ldbm_db_errcall( const char *prefix, char *message )
 {
 	Debug( LDAP_DEBUG_ANY, "ldbm_db_errcall(): %s %s", prefix, message, 0 );
 }