diff --git a/src/testdir/test_expr.vim b/src/testdir/test_expr.vim
index c5dd1f3..b131543 100644
--- a/src/testdir/test_expr.vim
+++ b/src/testdir/test_expr.vim
@@ -478,7 +478,7 @@
   endif
   eval set->setmatches()
   call assert_equal(exp, getmatches())
-  call assert_fails('let m = setmatches([], [])', 'E957:')
+  call assert_fails('let m = setmatches([], [])', 'E745:')
 endfunc
 
 func Test_empty_concatenate()