diff --git a/activesupport/lib/active_support/core_ext/kernel/debugger.rb b/activesupport/lib/active_support/core_ext/kernel/debugger.rb
index 7516f41e0b2..d5b590e9f05 100644
--- a/activesupport/lib/active_support/core_ext/kernel/debugger.rb
+++ b/activesupport/lib/active_support/core_ext/kernel/debugger.rb
@@ -2,7 +2,7 @@ module Kernel
   unless respond_to?(:debugger)
     # Starts a debugging session if ruby-debug has been loaded (call rails server --debugger to do load it).
     def debugger
-      message = "\n***** Debugger requested, but was not available (ensure ruby-debug is listed in Gemfile/installed as gem): Start server with --debugger to enable *****\n"
+      message = "\n***** Debugger requested, but was not available (ensure ruby-debug19 is listed in Gemfile/installed as gem): Start server with --debugger to enable *****\n"
       defined?(Rails) ? Rails.logger.info(message) : $stderr.puts(message)
     end
     alias breakpoint debugger unless respond_to?(:breakpoint)
diff --git a/railties/guides/code/getting_started/README.rdoc b/railties/guides/code/getting_started/README.rdoc
index 7c36f2356ec..904624a586e 100644
--- a/railties/guides/code/getting_started/README.rdoc
+++ b/railties/guides/code/getting_started/README.rdoc
@@ -86,8 +86,8 @@ programming in general.
 Debugger support is available through the debugger command when you start your
 Mongrel or WEBrick server with --debugger. This means that you can break out of
 execution at any point in the code, investigate and change the model, and then,
-resume execution! You need to install ruby-debug to run the server in debugging
-mode. With gems, use <tt>sudo gem install ruby-debug</tt>. Example:
+resume execution! You need to install ruby-debug19 to run the server in debugging
+mode. With gems, use <tt>sudo gem install ruby-debug19</tt>. Example:
 
   class WeblogController < ActionController::Base
     def index
diff --git a/railties/lib/rails/generators/rails/app/templates/README b/railties/lib/rails/generators/rails/app/templates/README
index 7c36f2356ec..904624a586e 100644
--- a/railties/lib/rails/generators/rails/app/templates/README
+++ b/railties/lib/rails/generators/rails/app/templates/README
@@ -86,8 +86,8 @@ programming in general.
 Debugger support is available through the debugger command when you start your
 Mongrel or WEBrick server with --debugger. This means that you can break out of
 execution at any point in the code, investigate and change the model, and then,
-resume execution! You need to install ruby-debug to run the server in debugging
-mode. With gems, use <tt>sudo gem install ruby-debug</tt>. Example:
+resume execution! You need to install ruby-debug19 to run the server in debugging
+mode. With gems, use <tt>sudo gem install ruby-debug19</tt>. Example:
 
   class WeblogController < ActionController::Base
     def index
diff --git a/railties/lib/rails/rack/debugger.rb b/railties/lib/rails/rack/debugger.rb
index 831188eeeec..5a78da1731f 100644
--- a/railties/lib/rails/rack/debugger.rb
+++ b/railties/lib/rails/rack/debugger.rb
@@ -12,7 +12,7 @@ module Rails
         ::Debugger.settings[:autoeval] = true if ::Debugger.respond_to?(:settings)
         puts "=> Debugger enabled"
       rescue LoadError
-        puts "You need to install ruby-debug to run the server in debugging mode. With gems, use 'gem install ruby-debug'"
+        puts "You need to install ruby-debug19 to run the server in debugging mode. With gems, use 'gem install ruby-debug19'"
         exit
       end