diff --git a/src/testdir/vim9.vim b/src/testdir/vim9.vim
index 7fbe4a5..2e4b03f 100644
--- a/src/testdir/vim9.vim
+++ b/src/testdir/vim9.vim
@@ -48,7 +48,7 @@
 
 " Check that a command fails both when used in a :def function and when used
 " in Vim9 script.
-def CheckScriptAndDefFailure(lines: list<string>, error: string, lnum = -3)
+def CheckDefAndScriptFailure(lines: list<string>, error: string, lnum = -3)
   CheckDefFailure(lines, error, lnum)
   CheckScriptFailure(['vim9script'] + lines, error, lnum + 1)
 enddef