diff --git a/pywb/apps/rewriterapp.py b/pywb/apps/rewriterapp.py
index cfa6e3e9..db1da528 100644
--- a/pywb/apps/rewriterapp.py
+++ b/pywb/apps/rewriterapp.py
@@ -348,6 +348,7 @@ class RewriterApp(object):
                                                        top_url,
                                                        environ,
                                                        framed_replay,
+                                                       replay_mod=self.replay_mod,
                                                        config=self.config))
 
         cookie_rewriter = None
diff --git a/pywb/templates/head_insert.html b/pywb/templates/head_insert.html
index 4ba5ef00..8c50c88e 100644
--- a/pywb/templates/head_insert.html
+++ b/pywb/templates/head_insert.html
@@ -18,7 +18,7 @@
   wbinfo.timestamp = "{{ cdx.timestamp }}";
   wbinfo.request_ts = "{{ wb_url.timestamp }}";
   wbinfo.prefix = decodeURI("{{ wb_prefix }}");
-  wbinfo.mod = "{{ wb_url.mod }}";
+  wbinfo.mod = "{{ replay_mod }}";
   wbinfo.is_framed = {{ is_framed }};
   wbinfo.is_live = {{ is_live }};
   wbinfo.coll = "{{ coll }}";