diff --git a/src/Invoker.php b/src/Invoker.php
index 0a530db..0c3d97d 100644
--- a/src/Invoker.php
+++ b/src/Invoker.php
@@ -135,7 +135,7 @@ private function resolveCallableFromContainer($callable)
                 return $this->container->get($callable);
             } else {
                 throw new NotCallableException(sprintf(
-                    '%s is neither a callable or a valid container entry',
+                    '%s is neither a callable nor a valid container entry',
                     $callable
                 ));
             }
diff --git a/tests/InvokerTest.php b/tests/InvokerTest.php
index 67e5212..3915df4 100644
--- a/tests/InvokerTest.php
+++ b/tests/InvokerTest.php
@@ -284,7 +284,7 @@ public function should_throw_if_calling_non_callable_without_container()
     /**
      * @test
      * @expectedException \Invoker\Exception\NotCallableException
-     * @expectedExceptionMessage foo is neither a callable or a valid container entry
+     * @expectedExceptionMessage foo is neither a callable nor a valid container entry
      */
     public function should_throw_if_calling_non_callable_with_container()
     {