diff --git a/Rakefile b/Rakefile
index 4f04404..8850efb 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,4 @@
+require 'md2man/roff/engine'
 require 'rake/clean'
 
 SOURCE_DIR = 'doc'.freeze
@@ -25,5 +26,6 @@ CLOBBER.include(OUTPUT_DIR)
 
 rule OUTPUT_EXT => -> (name) { out_to_source(name) } do |t|
   mkdir_p t.name.pathmap('%d')
-  sh "pandoc -s -t man -o '#{t.name}' '#{t.source}'"
+  roff_output = Md2Man::Roff::ENGINE.render(File.read(t.source))
+  File.write t.name, roff_output
 end
diff --git a/libexec/um-read.rb b/libexec/um-read.rb
index 96dcb3e..1ccbcce 100644
--- a/libexec/um-read.rb
+++ b/libexec/um-read.rb
@@ -1,3 +1,4 @@
+require 'md2man/roff/engine'
 require 'shellwords'
 require 'tempfile'
 require_relative '../lib/um.rb'
@@ -36,14 +37,8 @@
 if File.extname(page_path) == UmConfig::UM_MARKDOWN_EXT
   begin
     temp_file = Tempfile.new('um')
-    pandoc_output = `pandoc -s -t man "#{page_path}" > "#{temp_file.path}"`
-    unless $?.success?
-      $stderr.puts "Could not convert " +
-        "#{page_name} #{UM_MARKDOWN_EXT} file to man page."
-      $stderr.puts pandoc_output
-      exit 1
-    end
-
+    roff_output = Md2Man::Roff::ENGINE.render(File.read(page_path))
+    File.write temp_file.path, roff_output
     system(%{man "#{temp_file.path}"})
   ensure
     temp_file.unlink