diff --git a/source/library/Language/Haskell/Brittany/Internal/Layouters/Stmt.hs b/source/library/Language/Haskell/Brittany/Internal/Layouters/Stmt.hs
index 5ef19c7..4dc0383 100644
--- a/source/library/Language/Haskell/Brittany/Internal/Layouters/Stmt.hs
+++ b/source/library/Language/Haskell/Brittany/Internal/Layouters/Stmt.hs
@@ -19,7 +19,7 @@ import Language.Haskell.Brittany.Internal.Types
 
 
 
-layoutStmt :: ToBriDoc' (StmtLR GhcPs GhcPs (LHsExpr GhcPs))
+layoutStmt :: ToBriDoc' an (StmtLR GhcPs GhcPs (LHsExpr GhcPs))
 layoutStmt lstmt@(L _ stmt) = do
   indentPolicy <- mAsk <&> _conf_layout .> _lconfig_indentPolicy .> confUnpack
   indentAmount :: Int <-