diff -r 08c3ef07cef7 -r 5ebd327ffb96 Nominal/Ex/LetInv.thy
--- a/Nominal/Ex/LetInv.thy	Mon May 19 11:19:48 2014 +0100
+++ b/Nominal/Ex/LetInv.thy	Mon May 19 12:45:26 2014 +0100
@@ -223,7 +223,7 @@
   apply (simp add: Abs_eq_iff alphas supp_atom fresh_star_def neq)
   done
 
-nominal_primrec
+nominal_function
     subst  :: "name \<Rightarrow> trm \<Rightarrow> trm \<Rightarrow> trm"
 where
   "subst s t (Var x) = (if (s = x) then t else (Var x))"