diff --git a/check_upstream.rb b/check_upstream.rb
index 707a739eaf421abec00bc0c0f31c66c2eaf69795..fb0348958c55f7ed671dd0996c664cf6d983ffb1 100755
--- a/check_upstream.rb
+++ b/check_upstream.rb
@@ -44,7 +44,7 @@ end
 def clean_tags(tags)
 	new_tags = []
 	tags.each{|line|
-		new_tags = new_tags.append clean_tag(line, Prj_info)
+		new_tags = new_tags.push(clean_tag(line, Prj_info))
 	}
 	return new_tags
 end