diff --git a/lib/new_relic/agent.rb b/lib/new_relic/agent.rb
index 8e02786fa4..c1a6e0a082 100644
--- a/lib/new_relic/agent.rb
+++ b/lib/new_relic/agent.rb
@@ -102,8 +102,6 @@ class UnrecoverableAgentException < ServerConnectionException; end
     # An error while serializing data for the collector
     class SerializationError < StandardError; end
 
-    class BackgroundLoadingError < StandardError; end
-
     # placeholder name used when we cannot determine a transaction's name
     UNKNOWN_METRIC = '(unknown)'.freeze