diff --git a/markdown-preview-mode.el b/markdown-preview-mode.el
index 86e9374..8b936e1 100644
--- a/markdown-preview-mode.el
+++ b/markdown-preview-mode.el
@@ -30,6 +30,7 @@
 ;;
 ;;; Code:
 
+(eval-when-compile (require 'cl))
 (require 'cl-lib)
 (require 'websocket)
 (require 'markdown-mode)