diff --git a/lisp/org-agenda.el b/lisp/org-agenda.el
index 84b75a9..2833fca 100644
--- a/lisp/org-agenda.el
+++ b/lisp/org-agenda.el
@@ -390,32 +390,36 @@ the daily/weekly agenda, see `org-agenda-skip-function'.")
 			   (repeat :inline t :tag "Conditions for skipping"
 				   (choice
 				    :tag "Condition type"
-				    (list :tag "Regexp matches" :inline t (const :format "" regexp) (regexp))
-				    (list :tag "Regexp does not match" :inline t (const :format "" notregexp) (regexp))
+				    (list :tag "Regexp matches" :inline t
+					  (const :format "" 'regexp)
+					  (regexp))
+				    (list :tag "Regexp does not match" :inline t
+					  (const :format "" 'notregexp)
+					  (regexp))
 				    (list :tag "TODO state is" :inline t
-					  (const todo)
+					  (const 'todo)
 					  (choice
-					   (const :tag "any not-done state" todo)
-					   (const :tag "any done state" done)
-					   (const :tag "any state" any)
+					   (const :tag "Any not-done state" 'todo)
+					   (const :tag "Any done state" 'done)
+					   (const :tag "Any state" 'any)
 					   (list :tag "Keyword list"
 						 (const :format "" quote)
 						 (repeat (string :tag "Keyword")))))
 				    (list :tag "TODO state is not" :inline t
-					  (const nottodo)
+					  (const 'nottodo)
 					  (choice
-					   (const :tag "any not-done state" todo)
-					   (const :tag "any done state" done)
-					   (const :tag "any state" any)
+					   (const :tag "Any not-done state" 'todo)
+					   (const :tag "Any done state" 'done)
+					   (const :tag "Any state" 'any)
 					   (list :tag "Keyword list"
 						 (const :format "" quote)
 						 (repeat (string :tag "Keyword")))))
-				    (const :tag "scheduled" scheduled)
-				    (const :tag "not scheduled" notscheduled)
-				    (const :tag "deadline" deadline)
-				    (const :tag "no deadline" notdeadline)
-				    (const :tag "timestamp" timestamp)
-				    (const :tag "no timestamp" nottimestamp))))))
+				    (const :tag "scheduled" 'scheduled)
+				    (const :tag "not scheduled" 'notscheduled)
+				    (const :tag "deadline" 'deadline)
+				    (const :tag "no deadline" 'notdeadline)
+				    (const :tag "timestamp" 'timestamp)
+				    (const :tag "no timestamp" 'nottimestamp))))))
 		   (list :tag "Non-standard skipping condition"
 			 :value (org-agenda-skip-function)
 			 (const org-agenda-skip-function)