diff --git a/src/testdir/test_buffer.vim b/src/testdir/test_buffer.vim
index 5981e24..c8f6c5a 100644
--- a/src/testdir/test_buffer.vim
+++ b/src/testdir/test_buffer.vim
@@ -76,7 +76,7 @@
     let caught_E90 = 1
   endtry
   call assert_equal(1, caught_E90)
-  call assert_fails('$bunload', 'E515:')
+  call assert_fails('$bunload', 'E90:')
 endfunc
 
 " Test for :buffer, :bnext, :bprevious, :brewind, :blast and :bmodified
@@ -278,7 +278,7 @@
   call assert_equal(1, &modified)
   call assert_equal('', @%)
   call feedkeys('y', 'L')
-  call assert_fails('confirm b Xfile', 'E37:')
+  call assert_fails('confirm b Xfile', ['', 'E37:'])
   call assert_equal(1, &modified)
   call assert_equal('', @%)
   call feedkeys('n', 'L')