diff --git a/contrib/static/nntpchan.js b/contrib/static/nntpchan.js
index 1553981..406287a 100644
--- a/contrib/static/nntpchan.js
+++ b/contrib/static/nntpchan.js
@@ -41,8 +41,8 @@ function enable_theme(prefix, name) {
   if (theme) {
     theme.href = prefix + "static/"+ name + ".css";
     var st = get_storage();
-    st.setItem("nntpchan_prefix", prefix);
-    st.setItem("nntpchan_theme", name);
+    st.nntpchan_prefix = prefix;
+    st.nntpchan_theme = name;
   }
 }