diff --git a/lisp/progmodes/sql.el b/lisp/progmodes/sql.el
index e35ddf9419f..6d73abb1432 100644
--- a/lisp/progmodes/sql.el
+++ b/lisp/progmodes/sql.el
@@ -219,6 +219,10 @@
 (eval-when-compile ;; needed in Emacs 19, 20
   (setq max-specpdl-size 2000))
 
+(defvar font-lock-keyword-face)
+(defvar font-lock-set-defaults)
+(defvar font-lock-string-face)
+
 ;;; Allow customization
 
 (defgroup SQL nil