diff --git a/src/testdir/test_assert.vim b/src/testdir/test_assert.vim
index e0dc99e..51a0a3e 100644
--- a/src/testdir/test_assert.vim
+++ b/src/testdir/test_assert.vim
@@ -268,21 +268,21 @@
   catch
     let exp = v:exception
   endtry
-  call assert_match("E856: \"assert_fails()\" second argument", exp)
+  call assert_match("E1174: String required for argument 2", exp)
 
   try
     call assert_equal(1, assert_fails('xxx', 'E492', '', 'burp'))
   catch
     let exp = v:exception
   endtry
-  call assert_match("E1115: \"assert_fails()\" fourth argument must be a number", exp)
+  call assert_match("E1210: Number required for argument 4", exp)
 
   try
     call assert_equal(1, assert_fails('xxx', 'E492', '', 54, 123))
   catch
     let exp = v:exception
   endtry
-  call assert_match("E1116: \"assert_fails()\" fifth argument must be a string", exp)
+  call assert_match("E1174: String required for argument 5", exp)
 endfunc
 
 func Test_assert_fails_in_try_block()