diff --git a/lib/ruby_indexer/lib/ruby_indexer/entry.rb b/lib/ruby_indexer/lib/ruby_indexer/entry.rb
index e5946b9c29..3e55c1db28 100644
--- a/lib/ruby_indexer/lib/ruby_indexer/entry.rb
+++ b/lib/ruby_indexer/lib/ruby_indexer/entry.rb
@@ -3,6 +3,8 @@
 
 module RubyIndexer
   class Entry
+    class AbstractMethodInvokedError < StandardError; end
+
     #: Configuration
     attr_reader :configuration