--- a/src/HOL/HOLCF/Library/Option_Cpo.thy Wed Dec 22 17:51:22 2010 -0800
+++ b/src/HOL/HOLCF/Library/Option_Cpo.thy Wed Dec 22 18:23:48 2010 -0800
@@ -265,7 +265,7 @@
where "option_map f \<equiv> Abs_cfun (Option.map (Rep_cfun f))"
lemma option_map_ID [domain_map_ID]: "option_map ID = ID"
-by (simp add: ID_def cfun_eq_iff Option.map.identity)
+by (simp add: ID_def cfun_eq_iff Option.map.identity id_def)
lemma deflation_option_map [domain_deflation]:
"deflation d \<Longrightarrow> deflation (option_map d)"