diff --git a/s3/public.go b/s3/public.go
index a3e85a99..227c3373 100644
--- a/s3/public.go
+++ b/s3/public.go
@@ -142,7 +142,7 @@ func (storage *PublishedStorage) PutFile(path string, sourceFilename string) err
 	}
 	defer source.Close()
 
-	err = storage.putFile(path, source)
+	err = storage.putFile(path, source, "")
 	if err != nil {
 		err = errors.Wrap(err, fmt.Sprintf("error uploading %s to %s", sourceFilename, storage))
 	}
@@ -151,7 +151,7 @@ func (storage *PublishedStorage) PutFile(path string, sourceFilename string) err
 }
 
 // putFile uploads file-like object to
-func (storage *PublishedStorage) putFile(path string, source io.ReadSeeker) error {
+func (storage *PublishedStorage) putFile(path string, source io.ReadSeeker, sourceMD5 string) error {
 
 	params := &s3.PutObjectInput{
 		Bucket: aws.String(storage.bucket),
@@ -165,6 +165,11 @@ func (storage *PublishedStorage) putFile(path string, source io.ReadSeeker) erro
 	if storage.encryptionMethod != "" {
 		params.ServerSideEncryption = aws.String(storage.encryptionMethod)
 	}
+	if sourceMD5 != "" {
+		params.Metadata = map[string]*string{
+			"Md5": aws.String(sourceMD5),
+		}
+	}
 
 	_, err := storage.s3.PutObject(params)
 	if err != nil {
@@ -177,7 +182,7 @@ func (storage *PublishedStorage) putFile(path string, source io.ReadSeeker) erro
 			return err
 		}
 
-		return storage.putFile(strings.Replace(path, "+", " ", -1), source)
+		return storage.putFile(strings.Replace(path, "+", " ", -1), source, sourceMD5)
 	}
 	return nil
 }
@@ -318,7 +323,7 @@ func (storage *PublishedStorage) LinkFromPool(publishedDirectory, fileName strin
 	}
 	defer source.Close()
 
-	err = storage.putFile(relPath, source)
+	err = storage.putFile(relPath, source, sourceMD5)
 	if err == nil {
 		storage.pathCache[relPath] = sourceMD5
 	} else {