diff --git a/lib/datadog/tracing/metadata/ext.rb b/lib/datadog/tracing/metadata/ext.rb
index c93088f58df..e8d2a6f0ed2 100644
--- a/lib/datadog/tracing/metadata/ext.rb
+++ b/lib/datadog/tracing/metadata/ext.rb
@@ -74,6 +74,7 @@ module Errors
 
         # @public_api
         module HTTP
+          ERROR_RANGE = (500...600).freeze
           TAG_BASE_URL = 'http.base_url'
           TAG_METHOD = 'http.method'
           TAG_STATUS_CODE = 'http.status_code'