diff --git a/trytond/modules/__init__.py b/trytond/modules/__init__.py
index e7e2353624..eb4e65120f 100644
--- a/trytond/modules/__init__.py
+++ b/trytond/modules/__init__.py
@@ -300,9 +300,10 @@ def load_module_graph(graph, pool, update=None, lang=None):
             (module, to_delete) = modules_todo.pop()
             convert.post_import(pool, module, to_delete)
 
-        # Ensure cache is clear for other instances
-        Cache.clear_all()
-        Cache.refresh_pool(transaction)
+        if update:
+            # Ensure cache is clear for other instances
+            Cache.clear_all()
+            Cache.refresh_pool(transaction)
     logger.info('all modules loaded')