diff --git a/yaltik_crm_action/models/crm_action.py b/yaltik_crm_action/models/crm_action.py
index 7ba2115..c10efed 100644
--- a/yaltik_crm_action/models/crm_action.py
+++ b/yaltik_crm_action/models/crm_action.py
@@ -56,6 +56,15 @@ class CrmAction(models.Model):
             if action.lead_id and action.lead_id.partner_id:
                 action.partner_id = action.lead_id.partner_id
 
+    @api.onchange('partner_id')
+    def onchange_partner(self):
+        """ If partner changes, adapts lead to False """
+        for action in self:
+            if action.partner_id and action.lead_id:
+                if action.lead_id.partner_id != action.partner_id:
+                    action.lead_id = False
+
+
     @api.depends('action_type_id.name', 'details')
     def _compute_display_name(self):
         for action in self: