diff --git a/autoload/fzf/vim.vim b/autoload/fzf/vim.vim
index 7839916..1c3b0c7 100644
--- a/autoload/fzf/vim.vim
+++ b/autoload/fzf/vim.vim
@@ -1124,7 +1124,7 @@ function! s:commits(buffer_local, args)
 
   if !s:is_win && &columns > s:wide
     call extend(options.options,
-    \ ['--preview', 'grep -o "[a-f0-9]\{7,\}" <<< {} | xargs git show --format=format: --color=always | head -200'])
+    \ ['--preview', 'echo {} | grep -o "[a-f0-9]\{7,\}" | head -1 | xargs git show --format=format: --color=always | head -200'])
   endif
 
   return s:fzf(a:buffer_local ? 'bcommits' : 'commits', options, a:args)