diff --git a/base_view_inheritance_extension/models/ir_ui_view.py b/base_view_inheritance_extension/models/ir_ui_view.py
index 1f5235db6..09cf6e2ca 100644
--- a/base_view_inheritance_extension/models/ir_ui_view.py
+++ b/base_view_inheritance_extension/models/ir_ui_view.py
@@ -181,6 +181,7 @@ class IrUiView(models.Model):
                 else:
                     new_value = str(expression.AND([old_domain, new_domain]))
                 new_value = self.str2var_domain_text(new_value)
+                old_value = "".join(old_value.splitlines())
             else:
                 # We must ensure that the domain definition has not line breaks because
                 # in update mode the domain cause an invalid syntax error