diff --git a/ghc/compiler/rename/RnMonad.lhs b/ghc/compiler/rename/RnMonad.lhs
index f20b714d9c73aa0fdc680bfee931ee9ae7ebced1..26a57538b9aafb464b6b53fbbda2a1f679d202b4 100644
--- a/ghc/compiler/rename/RnMonad.lhs
+++ b/ghc/compiler/rename/RnMonad.lhs
@@ -354,8 +354,10 @@ renameSourceCode mod_name name_supply m
 
 	(if not (isEmptyBag errs) then
 		pprTrace "Urk! renameSourceCode found errors" (display errs) 
+#ifdef DEBUG
 	 else if not (isEmptyBag warns) then
 		pprTrace "Urk! renameSourceCode found warnings" (display warns)
+#endif
 	 else
 		id) $