diff --git a/app/config/config.yml b/app/config/config.yml
index 591b5294a..05c82e434 100644
--- a/app/config/config.yml
+++ b/app/config/config.yml
@@ -148,9 +148,9 @@ fos_rest:
     format_listener:
         enabled: true
         rules:
-            - { path: "^/api/entries/([0-9]+)/export.(.*)", priorities: ['epub', 'mobi', 'pdf', 'txt', 'csv'], fallback_format: false, prefer_extension: false }
-            - { path: "^/api", priorities: ['json', 'xml'], fallback_format: false, prefer_extension: false }
-            - { path: "^/annotations", priorities: ['json', 'xml'], fallback_format: false, prefer_extension: false }
+            - { path: "^/api/entries/([0-9]+)/export.(.*)", priorities: ['epub', 'mobi', 'pdf', 'txt', 'csv'], fallback_format: json, prefer_extension: false }
+            - { path: "^/api", priorities: ['json', 'xml'], fallback_format: json, prefer_extension: false }
+            - { path: "^/annotations", priorities: ['json', 'xml'], fallback_format: json, prefer_extension: false }
             # for an unknown reason, EACH REQUEST goes to FOS\RestBundle\EventListener\FormatListener
             # so we need to add custom rule for custom api export but also for all other routes of the application...
             - { path: '^/', priorities: ['text/html', '*/*'], fallback_format: html, prefer_extension: false }