diff --git a/lib/classes/Service.js b/lib/classes/Service.js
index 32fd3d620..7756e9a93 100644
--- a/lib/classes/Service.js
+++ b/lib/classes/Service.js
@@ -69,10 +69,11 @@ class Service {
           };
         }
 
-        if (['aws', 'azure', 'google', 'ibm'].indexOf(serverlessFile.provider.name) === -1) {
+        const providers = ['aws', 'azure', 'google', 'ibm'];
+        if (providers.indexOf(serverlessFile.provider.name) === -1) {
           const errorMessage = [
             `Provider "${serverlessFile.provider.name}" is not supported.`,
-            ' Valid values for provider are: aws, azure, google, ibm.',
+            ` Valid values for provider are: ${providers.join(', ')}.`,
             ' Please provide one of those values to the "provider" property in serverless.yml.',
           ].join('');
           throw new SError(errorMessage);