diff --git a/examples/dom/WebReconciler.re b/examples/dom/WebReconciler.re
index d45db42..ed856ef 100644
--- a/examples/dom/WebReconciler.re
+++ b/examples/dom/WebReconciler.re
@@ -5,6 +5,7 @@
   * This is just an example but you could use this to create interesting
   * CLI apps, with a react-like functional API!
 */
+open Js_of_ocaml
 
 exception InvalidNodePrimitiveMatchInUpdateInstance;