diff --git a/ghc/compiler/utils/Outputable.lhs b/ghc/compiler/utils/Outputable.lhs
index 15a2acf83a8a3a3186a130645b0458de1035c40d..582a0b63bf97f3abe14319ae435b3d39f6e867c5 100644
--- a/ghc/compiler/utils/Outputable.lhs
+++ b/ghc/compiler/utils/Outputable.lhs
@@ -42,7 +42,7 @@ module Outputable (
 
 	-- error handling
 	pprPanic, pprPanic#, pprError, pprTrace, assertPprPanic,
-	trace, panic, panic#, assertPanic
+	trace, panic, panic#, assertPanic, warnPprTrace
     ) where
 
 #include "HsVersions.h"