diff --git a/misc/vim/ftplugin/factor.vim b/misc/vim/ftplugin/factor.vim
index ced9e85719..87002f98ed 100644
--- a/misc/vim/ftplugin/factor.vim
+++ b/misc/vim/ftplugin/factor.vim
@@ -1,3 +1,9 @@
+" Only do this when not done yet for this buffer
+if exists("b:did_ftplugin")
+    finish
+endif
+let b:did_ftplugin = 1
+
 " Code formatting settings loosely adapted from:
 " http://concatenative.org/wiki/view/Factor/Coding%20Style