diff --git a/src/testdir/test_vim9_import.vim b/src/testdir/test_vim9_import.vim
index 415a7a9..f28b4ad 100644
--- a/src/testdir/test_vim9_import.vim
+++ b/src/testdir/test_vim9_import.vim
@@ -1234,6 +1234,8 @@
   redraw
 
   diffoff!
+  set diffexpr=
+  set diffopt&
   bwipe!
   bwipe!
   delete('Xdiffexpr')