diff --git a/lib/preprocess.rb b/lib/preprocess.rb
index 048c36b..6bdf76f 100644
--- a/lib/preprocess.rb
+++ b/lib/preprocess.rb
@@ -1,5 +1,5 @@
 module Uplot
-  module Preprocess
+  module Preprocessing
     module_function
 
     def input(input, delimiter, headers, transpose)
diff --git a/lib/uplot.rb b/lib/uplot.rb
index d47fa2c..c4146ca 100644
--- a/lib/uplot.rb
+++ b/lib/uplot.rb
@@ -1,6 +1,6 @@
 require 'unicode_plot'
 require 'uplot/version'
-require 'uplot/preprocess'
+require 'uplot/Preprocessing'
 require 'uplot/command.rb'
 
 module Uplot
diff --git a/lib/uplot/command.rb b/lib/uplot/command.rb
index b9ccba2..2451239 100644
--- a/lib/uplot/command.rb
+++ b/lib/uplot/command.rb
@@ -247,7 +247,7 @@ module Uplot
       while input = Kernel.gets(nil)
         input.freeze
         @raw_inputs << input
-        @data = Preprocess.input(input, @delimiter, @headers, @transpose)
+        @data = Preprocessing.input(input, @delimiter, @headers, @transpose)
         case plot_type
         when :bar, :barplot
           barplot(@data)
@@ -278,7 +278,7 @@ module Uplot
       headers = data.headers
       series = data.series
       if @count
-        series = Preprocess.count(series[0])
+        series = Preprocessing.count(series[0])
         params.title = headers[0] if headers
       end
       params.title ||= headers[1] if headers