diff --git a/servers/slapd/back-ldbm/dn2id.c b/servers/slapd/back-ldbm/dn2id.c
index 7cc4aec1e2..c3264715ca 100644
--- a/servers/slapd/back-ldbm/dn2id.c
+++ b/servers/slapd/back-ldbm/dn2id.c
@@ -133,6 +133,7 @@ dn2id_delete(
 		return( -1 );
 	}
 
+	dn = ch_strdup( dn );
 	dn_normalize_case( dn );
 	key.dptr = dn;
 	key.dsize = strlen( dn ) + 1;