diff --git a/src/testdir/test_lambda.vim b/src/testdir/test_lambda.vim
index 7a31dcc..4ff3e20 100644
--- a/src/testdir/test_lambda.vim
+++ b/src/testdir/test_lambda.vim
@@ -49,7 +49,7 @@
 
 function Test_lambda_fails()
   call assert_equal(3, {a, b -> a + b}(1, 2))
-  call assert_fails('echo {a, a -> a + a}(1, 2)', 'E15:')
+  call assert_fails('echo {a, a -> a + a}(1, 2)', 'E853:')
   call assert_fails('echo {a, b -> a + b)}(1, 2)', 'E15:')
 endfunc
 
@@ -169,7 +169,7 @@
   let l:D = s:NewCounter2()
 
   call assert_equal(1, l:C())
-  call assert_fails(':call l:D()', 'E15:') " E121: then E15:
+  call assert_fails(':call l:D()', 'E121:')
   call assert_equal(2, l:C())
 endfunc