diff --git a/lib/acts_as_taggable_on/acts_as_taggable_on/related.rb b/lib/acts_as_taggable_on/acts_as_taggable_on/related.rb
index 92ba3dc78..e9093e6fb 100644
--- a/lib/acts_as_taggable_on/acts_as_taggable_on/related.rb
+++ b/lib/acts_as_taggable_on/acts_as_taggable_on/related.rb
@@ -18,7 +18,11 @@ def find_related_#{tag_type}(options = {})
             def find_related_#{tag_type}_for(klass, options = {})
               related_tags_for('#{tag_type}', klass, options)
             end
-
+          )
+        end
+        
+        unless tag_types.empty?
+          class_eval %(
             def find_matching_contexts(search_context, result_context, options = {})
               matching_contexts_for(search_context.to_s, result_context.to_s, self.class, options)
             end