diff --git a/Formula/tflint.rb b/Formula/tflint.rb
index 108314b676..c293522b3e 100644
--- a/Formula/tflint.rb
+++ b/Formula/tflint.rb
@@ -17,7 +17,6 @@ class Tflint < Formula
 
   def install
     ENV["GOPATH"] = buildpath
-    ENV["GO111MODULE"] = "on"
 
     dir = buildpath/"src/github.com/wata727/tflint"
     dir.install buildpath.children