diff --git a/odoo/models.py b/odoo/models.py
index 964dbcbf5d9..355fe5636dc 100644
--- a/odoo/models.py
+++ b/odoo/models.py
@@ -65,7 +65,7 @@ _unlink = logging.getLogger(__name__ + '.unlink')
 regex_order = re.compile('^(\s*([a-z0-9:_]+|"[a-z0-9:_]+")(\s+(desc|asc))?\s*(,|$))+(?<!,)$', re.I)
 regex_object_name = re.compile(r'^[a-z0-9_.]+$')
 regex_pg_name = re.compile(r'^[a-z_][a-z0-9_$]*$', re.I)
-onchange_v7 = re.compile(r"^(\w+)\((.*)\)$")
+onchange_v7 = re.compile(r"^([a-zA-Z]\w+)\((.*)\)$")
 
 AUTOINIT_RECALCULATE_STORED_FIELDS = 1000