diff --git a/src/auth.js b/src/auth.js
index 37735cd..c421d5f 100644
--- a/src/auth.js
+++ b/src/auth.js
@@ -115,7 +115,7 @@ async function getClientToken(client, method, path, payload) {
         response = await client.post(`v1/auth/${path}/login`, options);
     } catch (err) {
         if (err instanceof got.HTTPError) {
-            throw Error(`failed to retrieve vault token. code: ${err.code}, message ${err.message}, vaultResponse: ${JSON.stringify(err.response.body)}`)
+            throw Error(`failed to retrieve vault token. code: ${err.code}, message: ${err.message}, vaultResponse: ${JSON.stringify(err.response.body)}`)
         } else {
             throw err
         }