diff --git a/src/testdir/test108.in b/src/testdir/test108.in
index b442cf7..59c4dfc 100644
--- a/src/testdir/test108.in
+++ b/src/testdir/test108.in
@@ -2,6 +2,7 @@
 
 STARTTEST
 :so small.vim
+:lang mess C
 :function! Foo()
 :   let var1 = 1
 :   let var2 = Bar(var1) + 9