diff --git a/Library/Homebrew/manpages.rb b/Library/Homebrew/manpages.rb
index 9e05bb8151..4fff2c93ac 100644
--- a/Library/Homebrew/manpages.rb
+++ b/Library/Homebrew/manpages.rb
@@ -3,10 +3,6 @@
 
 require "cli/parser"
 require "erb"
-require "kramdown"
-require "manpages/parser/ronn"
-require "manpages/converter/kramdown"
-require "manpages/converter/roff"
 
 SOURCE_PATH = (HOMEBREW_LIBRARY_PATH/"manpages").freeze
 TARGET_MAN_PATH = (HOMEBREW_REPOSITORY/"manpages").freeze
@@ -34,6 +30,11 @@ module Homebrew
     def self.regenerate_man_pages(quiet:)
       Homebrew.install_bundler_gems!(groups: ["man"])
 
+      require "kramdown"
+      require "manpages/parser/ronn"
+      require "manpages/converter/kramdown"
+      require "manpages/converter/roff"
+
       markup = build_man_page(quiet:)
       root, warnings = Parser::Ronn.parse(markup)
       $stderr.puts(warnings)