diff --git a/_config/config.yml b/_config/config.yml
index bd2ac08..a4e64fd 100644
--- a/_config/config.yml
+++ b/_config/config.yml
@@ -5,7 +5,7 @@ Name: silverstripe-mapboxfield
 SilverStripe\Core\Injector\Injector:
   A2nt\SilverStripeMapboxField\MarkerExtension:
     properties:
-      geocoder: %$Symbiote\Addressable\MapboxGeocodeService
+      geocoder: '%$Symbiote\Addressable\MapboxGeocodeService'
   Symbiote\Addressable\GeocodeServiceInterface:
     class: Symbiote\Addressable\MapboxGeocodeService