diff --git a/.circleci/config.yml b/.circleci/config.yml
index 6d48fe8d1..da3f160aa 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -13,7 +13,7 @@ jobs:
     working_directory: ~/.go_workspace/src/github.com/envoyproxy/protoc-gen-validate/java
     environment:
       MAVEN_OPTS: -Xms512m -Xmx1024m # Customize the JVM maximum heap limit
-      GO111MODULE: on
+      GO111MODULE: "on"
       CI_GO_VERSION: 1.14.3
     steps:
       - checkout: