diff --git a/syntax_checkers/eruby.vim b/syntax_checkers/eruby.vim
index e22ace11..46cf8b10 100644
--- a/syntax_checkers/eruby.vim
+++ b/syntax_checkers/eruby.vim
@@ -20,7 +20,7 @@ if !executable("ruby") || !executable("cat")
 endif
 
 function! SyntaxCheckers_eruby_GetLocList()
-    let makeprg='RUBYOPT= cat '. expand("%") . ' \| ruby -e "require \"erb\"; puts ERB.new(ARGF.read, nil, \"-\").src" \| ruby -c'
+    let makeprg='cat '. expand("%") . ' \| RUBYOPT= ruby -e "require \"erb\"; puts ERB.new(ARGF.read, nil, \"-\").src" \| RUBYOPT= ruby -c'
     let errorformat='%-GSyntax OK,%E-:%l: syntax error\, %m,%Z%p^,%W-:%l: warning: %m,%Z%p^,%-C%.%#'
     let loclist = SyntasticMake({ 'makeprg': makeprg, 'errorformat': errorformat })