diff --git a/lib/normalizy/rspec/matcher.rb b/lib/normalizy/rspec/matcher.rb
index 427c144..3501016 100644
--- a/lib/normalizy/rspec/matcher.rb
+++ b/lib/normalizy/rspec/matcher.rb
@@ -58,7 +58,7 @@ def matches?(subject)
         else
           @subject.send :"#{@attribute}=", @from
 
-          @subject[@attribute] == @to
+          @subject.send(@attribute) == @to
         end
       end