diff --git a/src/main/resources/bidder-config/openx.yaml b/src/main/resources/bidder-config/openx.yaml
index 78aa8020d30..9e8454131d4 100644
--- a/src/main/resources/bidder-config/openx.yaml
+++ b/src/main/resources/bidder-config/openx.yaml
@@ -1,6 +1,7 @@
 adapters:
   openx:
     endpoint: http://rtb.openx.net/prebid
+    ortb-version: "2.6"
     endpoint-compression: gzip
     meta-info:
       maintainer-email: prebid@openx.com