diff --git a/README.md b/README.md
index 97edaa73..64af964f 100644
--- a/README.md
+++ b/README.md
@@ -54,6 +54,7 @@ Windows developers may have trouble producing a zip file that marks the binary a
 
 Get the tool
 ``` shell
+set GO111MODULE=on
 go.exe get -u github.com/aws/aws-lambda-go/cmd/build-lambda-zip
 ```