diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index f74b8eb42b8..9ae8798d4fa 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -2259,7 +2259,7 @@ pub mod test {
             cf: ast::return_val
         };
         let generics = ast_util::empty_generics();
-        check_equal (&fun_to_str(&decl, abba_ident, &generics, mock_interner),
+        check_equal (&fun_to_str(&decl, abba_ident, None, &generics, mock_interner),
                      &~"fn abba()");
     }