diff --git a/plugin/asyncrun.vim b/plugin/asyncrun.vim
index f139c18..8960448 100644
--- a/plugin/asyncrun.vim
+++ b/plugin/asyncrun.vim
@@ -118,6 +118,9 @@
 "- Global Settings & Variables
 "----------------------------------------------------------------------
 
+if exists('g:sourced_asyncrun_plugin') | finish | endif
+let g:sourced_asyncrun_plugin = 1
+
 " script will be executed after finished.
 let g:asyncrun_exit = get(g:, 'asyncrun_exit', '')