diff --git a/adapters/vim/collab.vim b/adapters/vim/collab.vim
index e261243..65be146 100644
--- a/adapters/vim/collab.vim
+++ b/adapters/vim/collab.vim
@@ -1,3 +1,7 @@
+if !has('vim9script') || v:version < 900
+    finish
+endif
+
 vim9script
 
 # collab.vim - collaborative editing adapter for collabd