diff --git a/runtime/world.js b/runtime/world.js
index 5034378..96fd330 100755
--- a/runtime/world.js
+++ b/runtime/world.js
@@ -63,7 +63,8 @@ function getDriverInstance() {
                 throw new Error('Could not find driver file: ' + driverFileName);
             }
 
-            driver = require(driverFileName)();
+            var CustomDriver = require(driverFileName)();
+            driver = new CustomDriver();
         }
     }