diff --git a/odoo/addons/base/models/ir_fields.py b/odoo/addons/base/models/ir_fields.py
index 0ed56061caa..ec556509d9e 100644
--- a/odoo/addons/base/models/ir_fields.py
+++ b/odoo/addons/base/models/ir_fields.py
@@ -604,7 +604,7 @@ class IrFieldsConverter(models.AbstractModel):
         def log(f, exception):
             if not isinstance(exception, Warning):
                 current_field_name = self.env[field.comodel_name]._fields[f].string
-                arg0 = exception.args[0] % {'field': '%(field)s/' + current_field_name}
+                arg0 = exception.args[0].replace('%(field)s', '%(field)s/' + current_field_name)
                 exception.args = (arg0, *exception.args[1:])
                 raise exception
             warnings.append(exception)
diff --git a/odoo/addons/test_impex/tests/test_load.py b/odoo/addons/test_impex/tests/test_load.py
index b9d365baf61..2a6b506c47d 100644
--- a/odoo/addons/test_impex/tests/test_load.py
+++ b/odoo/addons/test_impex/tests/test_load.py
@@ -1033,6 +1033,14 @@ class test_o2m(ImporterCase):
         [b] = self.browse()
         self.assertEqual(b.value.m2o.value, 101)
 
+    def test_escape_m2o_in_o2m(self):
+        result = self.import_(['value/m2o'], [['21%']])
+        self.assertEqual(result['messages'], [message(
+            u"No matching record found for name '21%' "
+            u"in field 'Value/M2O'", moreinfo=moreaction(
+                res_model='export.integer'),
+            field_name='Value', field_path=['value', 'm2o'], field_type='name', value='21%')])
+
 
 class test_o2m_multiple(ImporterCase):
     model_name = 'export.one2many.multiple'