diff --git a/lib/rx-file.rb b/lib/rx-file.rb
index a52ea21..ed94824 100644
--- a/lib/rx-file.rb
+++ b/lib/rx-file.rb
@@ -48,7 +48,7 @@ String.class_eval do
     "'" + self + "'"
   end
 end
-Fixnum.class_eval do
+Integer.class_eval do
   def to_rxf()
     to_s
   end