diff --git a/activesupport/lib/active_support/core_ext/kernel.rb b/activesupport/lib/active_support/core_ext/kernel.rb
index 1922d804bfa18141dbd84dc249258d69b5626ce8..848e92d1759775d50d4f6f3909d20017e926e939 100644
--- a/activesupport/lib/active_support/core_ext/kernel.rb
+++ b/activesupport/lib/active_support/core_ext/kernel.rb
@@ -1,5 +1,4 @@
 require 'active_support/core_ext/kernel/daemonizing'
 require 'active_support/core_ext/kernel/reporting'
-require 'active_support/core_ext/kernel/agnostics'
 require 'active_support/core_ext/kernel/requires'
 require 'active_support/core_ext/kernel/debugger'
diff --git a/activesupport/lib/active_support/core_ext/kernel/agnostics.rb b/activesupport/lib/active_support/core_ext/kernel/agnostics.rb
deleted file mode 100644
index c0cb4fb427d8a3a7dc2fd0758a437d89508afc53..0000000000000000000000000000000000000000
--- a/activesupport/lib/active_support/core_ext/kernel/agnostics.rb
+++ /dev/null
@@ -1,11 +0,0 @@
-class Object
-  # Makes backticks behave (somewhat more) similarly on all platforms.
-  # On win32 `nonexistent_command` raises Errno::ENOENT; on Unix, the
-  # spawned shell prints a message to stderr and sets $?.  We emulate
-  # Unix on the former but not the latter.
-  def `(command) #:nodoc:
-    super
-  rescue Errno::ENOENT => e
-    STDERR.puts "#$0: #{e}"
-  end
-end
\ No newline at end of file