diff --git a/src/testdir/test87.in b/src/testdir/test87.in
index 7d8ba3c..51425d6 100644
--- a/src/testdir/test87.in
+++ b/src/testdir/test87.in
@@ -3,6 +3,7 @@
 STARTTEST
 :so small.vim
 :if !has('python3') | e! test.ok | wq! test.out | endif
+:lang C
 :py3 import vim
 :fun Test()
 :let l = []