diff --git a/frontend/cli_to_rails_proxy.js b/frontend/cli_to_rails_proxy.js
index ea7e984dea1e..ca52925bde70 100644
--- a/frontend/cli_to_rails_proxy.js
+++ b/frontend/cli_to_rails_proxy.js
@@ -1,4 +1,4 @@
-const PROXY_HOSTNAME = process.env.PROXY_HOSTNAME || 'localhost';
+const PROXY_HOSTNAME = process.env.PROXY_HOSTNAME || process.env.HOST || 'localhost';
 const PORT = process.env.PORT || '3000';
 
 const PROXY_CONFIG = [