diff --git a/addons/utm/models/ir_http.py b/addons/utm/models/ir_http.py
index d690d42399c..ed12d6061d0 100644
--- a/addons/utm/models/ir_http.py
+++ b/addons/utm/models/ir_http.py
@@ -11,7 +11,7 @@ class IrHttp(models.AbstractModel):
 
     def _dispatch(self):
         response = super(IrHttp, self)._dispatch()
-        for var, dummy, cook in self.pool['utm.mixin'].tracking_fields():
+        for var, dummy, cook in request.env['utm.mixin'].tracking_fields():
             if var in request.params and request.httprequest.cookies.get(var) != request.params[var]:
                 response.set_cookie(cook, request.params[var], domain=self.get_utm_domain_cookies())
         return response
diff --git a/addons/utm/models/utm.py b/addons/utm/models/utm.py
index 7100a63e558..7285d9cd07e 100644
--- a/addons/utm/models/utm.py
+++ b/addons/utm/models/utm.py
@@ -47,7 +47,7 @@ class UtmMixin(models.AbstractModel):
         # Limitation by the heritage on AbstractModel
         # record_crm_lead.tracking_fields() will call tracking_fields() from module utm.mixin (if not overridden on crm.lead)
         # instead of the overridden method from utm.mixin.
-        # To force the call of overridden method, we use self.pool['utm.mixin'].tracking_fields() which respects overridden
+        # To force the call of overridden method, we use self.env['utm.mixin'].tracking_fields() which respects overridden
         # methods of utm.mixin, but will ignore overridden method on crm.lead
         return [
             # ("URL_PARAMETER", "FIELD_NAME_MIXIN", "NAME_IN_COOKIES")