diff --git a/src/Pecee/SimpleRouter/RouterBase.php b/src/Pecee/SimpleRouter/RouterBase.php
index 0fcd3c8..d73b67a 100644
--- a/src/Pecee/SimpleRouter/RouterBase.php
+++ b/src/Pecee/SimpleRouter/RouterBase.php
@@ -188,7 +188,7 @@ class RouterBase {
         if($this->request->loadedRoute !== null && $this->request->loadedRoute->exceptionHandler !== null) {
             $handler = new $this->request->loadedRoute->exceptionHandler();
             if(!($handler instanceof IExceptionHandler)) {
-                throw new RouterException('Exception handler must be instanceof IExceptionHandler.');
+                throw new RouterException('Exception handler must implement the IExceptionHandler interface.');
             }
 
             $handler->handleError($this->request, $this->request->loadedRoute, $e);