diff --git a/src/testdir/test_syntax.vim b/src/testdir/test_syntax.vim
index ee9406b..2a7398f 100644
--- a/src/testdir/test_syntax.vim
+++ b/src/testdir/test_syntax.vim
@@ -348,7 +348,7 @@
   call assert_fails('syntax sync x', 'E404:')
   call assert_fails('syntax keyword Abc a[', 'E789:')
   call assert_fails('syntax keyword Abc a[bc]d', 'E890:')
-  call assert_fails('syntax cluster Abc add=A add=', 'E475:')
+  call assert_fails('syntax cluster Abc add=A add=', 'E406:')
 
   " Test for too many \z\( and unmatched \z\(
   " Not able to use assert_fails() here because both E50:/E879: and E475: