diff --git a/homeassistant/components/calendar/__init__.py b/homeassistant/components/calendar/__init__.py
index 6f7427a0234..3528608dde3 100644
--- a/homeassistant/components/calendar/__init__.py
+++ b/homeassistant/components/calendar/__init__.py
@@ -35,9 +35,9 @@ async def async_setup(hass, config):
     hass.http.register_view(CalendarListView(component))
     hass.http.register_view(CalendarEventView(component))
 
-    # Doesn't work in prod builds of the frontend: home-assistant-polymer#1289
-    # hass.components.frontend.async_register_built_in_panel(
-    #     'calendar', 'calendar', 'hass:calendar')
+    hass.components.frontend.async_register_built_in_panel(
+        "calendar", "calendar", "hass:calendar"
+    )
 
     await component.async_setup(config)
     return True