diff --git a/autoload/fugitive.vim b/autoload/fugitive.vim
index 4a5b108..d403908 100644
--- a/autoload/fugitive.vim
+++ b/autoload/fugitive.vim
@@ -1641,7 +1641,7 @@ function! s:ReplaceCmd(cmd) abort
   let temp = tempname()
   let [err, exec_error] = s:TempCmd(temp, a:cmd)
   if exec_error
-    call s:throw((len(err) ? err : filereadable(temp) ? join(readfile(temp), ' ') : 'unknown error running ' . a:cmd))
+    call s:throw((len(err) ? err : 'unknown error running ' . a:cmd))
   endif
   setlocal noswapfile
   silent exe 'lockmarks keepalt 0read ++edit' s:fnameescape(temp)