diff --git a/lib/main.js b/lib/main.js
index cf6188e..8c40ef9 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -857,7 +857,7 @@ they may not work as expected in the Lambda environment.
     } else {
       return lambda.listTags({ Resource: functionArn }).promise()
         .then(data => {
-          const keys = Object.keys(data.Tags)
+          const keys = Object.keys(data.Tags).filter(name => !name.startsWith('aws:'))
           return keys && keys.length > 0
             ? lambda.untagResource({ Resource: functionArn, TagKeys: keys }).promise()
             : Promise.resolve()