diff --git a/flycheck-dart.el b/flycheck-dart.el
index fc51c62..23cbac2 100644
--- a/flycheck-dart.el
+++ b/flycheck-dart.el
@@ -32,6 +32,8 @@
 
 ;;; Code:
 
+(require 'flycheck)
+
 (flycheck-define-checker dart
   "Dart static analyzer using dart analyze."
   :command ("dart" "analyze" "--format=machine" source)