diff --git a/compiler/typecheck/TcMatches.hi-boot-6 b/compiler/typecheck/TcMatches.hi-boot-6
index b32523238b0b8fb4c08d3ad8091df364684d12e2..3a4865a9425677fb07647be370ce0d14469fa17a 100644
--- a/compiler/typecheck/TcMatches.hi-boot-6
+++ b/compiler/typecheck/TcMatches.hi-boot-6
@@ -5,6 +5,7 @@ tcGRHSsPat    :: HsExpr.GRHSs Name.Name
 	      -> TcRnTypes.TcM (HsExpr.GRHSs TcRnTypes.TcId)
 
 tcMatchesFun :: Name.Name
+             -> GHC.Base.Bool
 	     -> HsExpr.MatchGroup Name.Name
 	     -> TcType.BoxyRhoType
 	     -> TcRnTypes.TcM (HsBinds.HsWrapper, HsExpr.MatchGroup TcRnTypes.TcId)