diff --git a/lib/plugins/config/config.js b/lib/plugins/config/config.js
index baed17f92..79517841a 100644
--- a/lib/plugins/config/config.js
+++ b/lib/plugins/config/config.js
@@ -3,11 +3,11 @@
 const userStats = require('../../utils/userStats');
 
 // class wide constants
-const validProviders = ['aws'];
+const validProviders = new Set(['aws']);
 
 // TODO: update to look like the list in the "create" plugin
 // once more than one provider is supported
-const humanReadableProvidersList = `"${validProviders}"`;
+const humanReadableProvidersList = `"${Array.from(validProviders)}"`;
 
 class Config {
   constructor(serverless, options) {
@@ -43,7 +43,7 @@ class Config {
   validate() {
     const provider = this.options.provider.toLowerCase();
 
-    if (validProviders.indexOf(provider) === -1) {
+    if (!validProviders.has(provider)) {
       const errorMessage = [
         `Provider "${provider}" is not supported.`,
         ` Supported providers are: ${humanReadableProvidersList}.`,