diff --git a/contrib/babel/lisp/langs/org-babel-css.el b/contrib/babel/lisp/langs/org-babel-css.el
index 96c9fdcb6..4b5331d5b 100644
--- a/contrib/babel/lisp/langs/org-babel-css.el
+++ b/contrib/babel/lisp/langs/org-babel-css.el
@@ -36,6 +36,8 @@
 
 (add-to-list 'org-babel-tangle-langs '("css" "css" nil t))
 
+(defun org-babel-expand-body:css (body params &optional processed-params) body)
+
 (defun org-babel-execute:css (body params)
   "Execute a block of CSS code with org-babel.  This function is
 called by `org-babel-execute-src-block'."