diff --git a/lib/helper_patches.rb b/lib/helper_patches.rb
index 117f1213..815a4e32 100644
--- a/lib/helper_patches.rb
+++ b/lib/helper_patches.rb
@@ -56,5 +56,5 @@ def short_alternative_price_text(price)
     end
 
     prepend AlternativePriceText
-  end
+  end if defined?(AlaveteliPro::PriceHelper)
 end