diff --git a/slackcat.go b/slackcat.go
index 8eef25d..234288e 100644
--- a/slackcat.go
+++ b/slackcat.go
@@ -117,7 +117,7 @@ func (sc *Slackcat) postFile(filePath, fileName, fileType, fileComment string) {
 	}
 
 	start := time.Now()
-	err := api.FilesUpload(&slack.FilesUploadOpt{
+	_, err := api.FilesUpload(&slack.FilesUploadOpt{
 		Filepath:       filePath,
 		Filename:       fileName,
 		Filetype:       fileType,