diff --git a/lib/mutant.rb b/lib/mutant.rb
index 9d2c21c8..4a8a0330 100644
--- a/lib/mutant.rb
+++ b/lib/mutant.rb
@@ -76,7 +76,7 @@ module Mutant
   #
   # @api private
   #
-  def self.random_fixnum
+  def self.random_float
     Random.rand
   end
 end