diff --git a/addons/account/project/project_view.xml b/addons/account/project/project_view.xml
index 8fd35a21a89..983d8311229 100644
--- a/addons/account/project/project_view.xml
+++ b/addons/account/project/project_view.xml
@@ -88,7 +88,8 @@
                     </group>
                     <notebook colspan="4">
                         <page string="Account Data">
-                            <field name="partner_id" select="1"/>
+                            <field name="partner_id" select="1" on_change="onchange_partner_id(partner_id)"/>
+                            <field name="contact_id" invisible="1"/>
                             <field name="currency_id" select="1"/>
                             <newline/>
                             <field name="date_start"/>
diff --git a/addons/analytic/analytic.py b/addons/analytic/analytic.py
index 6dfaac21e70..e487a742e47 100644
--- a/addons/analytic/analytic.py
+++ b/addons/analytic/analytic.py
@@ -236,6 +236,13 @@ class account_analytic_account(osv.osv):
             res['value']['partner_id'] = partner
         return res
 
+    def onchange_partner_id(self, cr, uid, ids, partner, context=None):
+        partner_obj = self.pool.get('res.partner')
+        if not partner:
+            return {'value':{'contact_id': False}}
+        address = partner_obj.address_get(cr, uid, [partner], ['contact'])
+        return {'value':{'contact_id': address['contact']}}
+
     def name_search(self, cr, uid, name, args=None, operator='ilike', context=None, limit=100):
         if not args:
             args=[]