diff --git a/plugin/extradite.vim b/plugin/extradite.vim
index e09d526..0fcaf38 100644
--- a/plugin/extradite.vim
+++ b/plugin/extradite.vim
@@ -243,7 +243,7 @@ function! s:SimpleDiff(git_cmd,a,b) abort
 
   setlocal modifiable
     silent! %delete _
-    let diff = system(a:git_cmd.' diff '.a:a.' '.a:b)
+    let diff = system(a:git_cmd.' diff --no-ext-diff '.a:a.' '.a:b)
     silent put = diff
   setlocal ft=diff buftype=nofile nomodifiable