diff --git a/lib/conf.d/configuration.yml b/lib/conf.d/configuration.yml
index 4803532646..71580cbbfe 100644
--- a/lib/conf.d/configuration.yml
+++ b/lib/conf.d/configuration.yml
@@ -232,7 +232,7 @@ embed_bundle:
         autoplay: false
     document:
         #player: flexpaper
-        enable-pdfjs: true
+        enable_pdfjs: true
 geocoding-providers:
     -
         map-provider: 'mapboxWebGL'