diff --git a/src/node.cc b/src/node.cc
index 4cedfbc018..94b8c44680 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -1986,6 +1986,15 @@ static Handle<Object> GetFeatures() {
   obj->Set(String::NewSymbol("tls"),
       Boolean::New(get_builtin_module("crypto") != NULL));
 
+
+  obj->Set(String::NewSymbol("isolates"),
+#if HAVE_ISOLATES
+    True()
+#else
+    False()
+#endif
+  );
+
   return scope.Close(obj);
 }