diff --git a/contrib/static/newboard.js b/contrib/static/newboard.js
index 8cf96f7..99b1a2f 100644
--- a/contrib/static/newboard.js
+++ b/contrib/static/newboard.js
@@ -1,6 +1,10 @@
 function createBoard() {
   var form = document.getElementById("postform");
   var e = document.getElementById("boardname");
-  form.action = form.action + e.value;
+  var board = e.value;
+  if ( ! board.startsWith("overchan.") ) {
+    board = "overchan." + board;
+  }
+  form.action = form.action + board;
   form.submit();
 }