diff --git a/lib/repr.js b/lib/repr.js
index c6f6d97..a022e36 100644
--- a/lib/repr.js
+++ b/lib/repr.js
@@ -4,6 +4,10 @@
 // readable string representations of values
 exports.repr = repr;
 
+exports.extendNative = function() {
+  global.repr = repr;
+};
+
 function repr(x) {
   if (x !== null && x !== undefined && typeof x.repr === 'function') return x.repr();
 
@@ -43,4 +47,4 @@ function repr(x) {
   }
 
   throw new Error("don't know how to represent " + x);
-};
+}