diff --git a/CHANGELOG b/CHANGELOG
index 6381d1b567..3180af6e44 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+* Add has_window_functions on Database
 * Allow Many2One on ModelSQL to target ModelStorage
 * Manage Cache in Transaction
 * Allow to register multiple exit functions on Transaction
diff --git a/trytond/backend/database.py b/trytond/backend/database.py
index a2f0402782..9345f84516 100644
--- a/trytond/backend/database.py
+++ b/trytond/backend/database.py
@@ -155,3 +155,7 @@ class DatabaseInterface(object):
     def has_select_for(self):
         "Return if database supports FOR UPDATE/SHARE clause in SELECT."
         return False
+
+    def has_window_functions(self):
+        "Return if database supports window functions."
+        return False
diff --git a/trytond/backend/postgresql/database.py b/trytond/backend/postgresql/database.py
index c95358b340..dd784a5481 100644
--- a/trytond/backend/postgresql/database.py
+++ b/trytond/backend/postgresql/database.py
@@ -304,6 +304,9 @@ class Database(DatabaseInterface):
     def has_select_for(self):
         return True
 
+    def has_window_functions(self):
+        return True
+
 register_type(UNICODE)
 if PYDATE:
     register_type(PYDATE)