diff --git a/apps/tc/elpi/ho_compile.elpi b/apps/tc/elpi/ho_compile.elpi
index e598ef5d5..00b02f9c8 100644
--- a/apps/tc/elpi/ho_compile.elpi
+++ b/apps/tc/elpi/ho_compile.elpi
@@ -369,10 +369,10 @@ namespace tc {
       decompile-problematic-term A L A L :- var A, !.
 
       decompile-problematic-term (fun N Ty Bo) L (fun N Ty' Bo') L3 :-
+        fold-map Ty L Ty' L1,
         (pi x\ fold-map (Bo x) [] (Bo' x) (Lx x)),
-        close-term-no-prune-ty Lx Ty L1,
-        fold-map Ty L Ty' L2,
-        std.append L2 L1 L3.
+        close-term-no-prune-ty Lx Ty' L2,
+        std.append L1 L2 L3.
 
       decompile-problematic-term (prod N Ty Bo) L (prod N Ty' Bo') L3 :-
         (pi x\ fold-map (Bo x) [] (Bo' x) (Lx x)),
@@ -422,4 +422,4 @@ namespace tc {
         std.assert!(goal.compile GoalPrecomp EtaLinks Goal' Links) "[TC] cannot compile goal"
       ).
   }
-}
\ No newline at end of file
+}