diff --git a/compiler/typecheck/TcMatches.hs b/compiler/typecheck/TcMatches.hs
index 6b727ed5aaa36eb7ba4460a26d489d39c0912f24..93e47ac1d92322014d899b15baa03fee902cc3dc 100644
--- a/compiler/typecheck/TcMatches.hs
+++ b/compiler/typecheck/TcMatches.hs
@@ -72,7 +72,7 @@ See Note [sig_tau may be polymorphic] in TcPat.
 
 tcMatchesFun :: Located Name
              -> MatchGroup GhcRn (LHsExpr GhcRn)
-             -> ExpRhoType     -- Expected type of function
+             -> ExpSigmaType    -- Expected type of function
              -> TcM (HsWrapper, MatchGroup GhcTcId (LHsExpr GhcTcId))
                                 -- Returns type of body
 tcMatchesFun fn@(L _ fun_name) matches exp_ty
diff --git a/compiler/typecheck/TcMatches.hs-boot b/compiler/typecheck/TcMatches.hs-boot
index 812b5107d3ca06436497c90afbc63dd1b30c2684..42640151ce044cb7dfc88ef1a955dcb6b7e4bb99 100644
--- a/compiler/typecheck/TcMatches.hs-boot
+++ b/compiler/typecheck/TcMatches.hs-boot
@@ -2,7 +2,7 @@ module TcMatches where
 import HsSyn    ( GRHSs, MatchGroup, LHsExpr )
 import TcEvidence( HsWrapper )
 import Name     ( Name )
-import TcType   ( ExpRhoType, TcRhoType )
+import TcType   ( ExpSigmaType, TcRhoType )
 import TcRnTypes( TcM )
 import SrcLoc   ( Located )
 import HsExtension ( GhcRn, GhcTcId )
@@ -13,5 +13,5 @@ tcGRHSsPat    :: GRHSs GhcRn (LHsExpr GhcRn)
 
 tcMatchesFun :: Located Name
              -> MatchGroup GhcRn (LHsExpr GhcRn)
-             -> ExpRhoType
+             -> ExpSigmaType
              -> TcM (HsWrapper, MatchGroup GhcTcId (LHsExpr GhcTcId))