diff --git a/modules/gammaBidAdapter.js b/modules/gammaBidAdapter.js
index 8240df3d151..516f716fa76 100644
--- a/modules/gammaBidAdapter.js
+++ b/modules/gammaBidAdapter.js
@@ -50,6 +50,15 @@ export const spec = {
     }
 
     return bids;
+  },
+
+  getUserSyncs: function(syncOptions) {
+    if (syncOptions.iframeEnabled) {
+      return [{
+        type: 'iframe',
+        url: '//' + ENDPOINT + '/adx/usersync'
+      }];
+    }
   }
 }