diff --git a/addons/resource/resource_view.xml b/addons/resource/resource_view.xml
index 7663a5af5d4..424955d0584 100644
--- a/addons/resource/resource_view.xml
+++ b/addons/resource/resource_view.xml
@@ -225,7 +225,7 @@
                        </group>
                        <group colspan="2" col="2">
                            <field name="date_from"/>
-                           <field name="calendar_id" string="Working Period" readonly='1'/>
+                           <field name="calendar_id" string="Working Period"/>
                            <field name="company_id" widget="selection" groups="base.group_multi_company"/>
                        </group>
                        <group colspan="2" col="2">