diff --git a/src/Init/Lean/Parser/Parser.lean b/src/Init/Lean/Parser/Parser.lean
index f4201dbc30..00115a7f09 100644
--- a/src/Init/Lean/Parser/Parser.lean
+++ b/src/Init/Lean/Parser/Parser.lean
@@ -1461,7 +1461,7 @@ registerAttribute {
      match decl.type with
      | Expr.const `Lean.Parser.TrailingParser _ _ =>
        declareTrailingBuiltinParser env refDeclName declName
-     | Expr.app (Expr.const `Lean.Parser.Parser _ _) (Expr.const `Lean.Parser.ParserKind.leading _ _) _ =>
+     | Expr.app (Expr.const `Lean.Parser.Parser _ _) (Expr.const `Lean.ParserKind.leading _ _) _ =>
        declareLeadingBuiltinParser env refDeclName declName
      | _ =>
        throw (IO.userError ("unexpected parser type at '" ++ toString declName ++ "' (`Parser` or `TrailingParser` expected"))