diff --git a/config/services.yaml b/config/services.yaml
index 11c095d99..037b57f6d 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -11,3 +11,6 @@ services:
         autowire: true      # Automatically injects dependencies in your services.
         autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.
 
+when@dev:
+    services:
+        ChampsLibres\WopiLib\Contract\Service\ProofValidatorInterface: '@Chill\WopiBundle\Service\Wopi\NullProofValidator'