diff --git a/runtime/indent/testdir/runtest.vim b/runtime/indent/testdir/runtest.vim
index 9502c42f3e..945c2753e9 100644
--- a/runtime/indent/testdir/runtest.vim
+++ b/runtime/indent/testdir/runtest.vim
@@ -10,6 +10,7 @@ filetype indent on
 syn on
 set nowrapscan
 set report=9999
+set modeline
 
 au! SwapExists * call HandleSwapExists()
 func HandleSwapExists()