diff --git a/servers/slapd/dn.c b/servers/slapd/dn.c
index 151d6d35ce..42d4be5990 100644
--- a/servers/slapd/dn.c
+++ b/servers/slapd/dn.c
@@ -1299,7 +1299,7 @@ build_new_dn( struct berval * new_dn,
 	new_dn->bv_len = parent_dn->bv_len + newrdn->bv_len + 1;
 	new_dn->bv_val = (char *) slap_sl_malloc( new_dn->bv_len + 1, memctx );
 
-	ptr = lutil_strcopy( new_dn->bv_val, newrdn->bv_val );
+	ptr = lutil_strncopy( new_dn->bv_val, newrdn->bv_val, newrdn->bv_len );
 	*ptr++ = ',';
 	strcpy( ptr, parent_dn->bv_val );
 }