diff --git a/autoload/fzf/vim/ipc.vim b/autoload/fzf/vim/ipc.vim
index f0c47e2..a562d50 100644
--- a/autoload/fzf/vim/ipc.vim
+++ b/autoload/fzf/vim/ipc.vim
@@ -43,7 +43,7 @@ function! fzf#vim#ipc#start(Callback)
   endif
 
   let fifo = tempname()
-  call system('mkfifo '..shellescape(fifo))
+  call system('mkfifo '.shellescape(fifo))
   if v:shell_error
     if !exists('s:mkfifo_failed')
       let s:mkfifo_failed = 1