diff --git a/Signum.Engine/Connection/PostgreSqlConnector.cs b/Signum.Engine/Connection/PostgreSqlConnector.cs
index c86878cd28..fbcc6f6e39 100644
--- a/Signum.Engine/Connection/PostgreSqlConnector.cs
+++ b/Signum.Engine/Connection/PostgreSqlConnector.cs
@@ -436,6 +436,7 @@ FOR r IN (SELECT pns.nspname, pc.relname
                 FROM pg_class pc, pg_namespace pns
                 WHERE pns.oid=pc.relnamespace
                     AND pns.nspname NOT IN ('information_schema', 'pg_catalog', 'pg_toast')
+                    AND pc.relname NOT LIKE 'pg_%'
                     AND pc.relkind IN ('v', 'm')
             ) LOOP
                 EXECUTE format('DROP VIEW %I.%I;',