diff --git a/lib/rspec/core.rb b/lib/rspec/core.rb
index 80c8211e03..5ee9fb89b4 100644
--- a/lib/rspec/core.rb
+++ b/lib/rspec/core.rb
@@ -1,5 +1,6 @@
 require 'rspec/core/kernel_extensions'
 require 'rspec/core/object_extensions'
+require 'rspec/core/module_extensions'
 require 'rspec/core/load_path'
 require 'rspec/core/deprecation'
 require 'rspec/core/reporter'
diff --git a/lib/rspec/core/module_extensions.rb b/lib/rspec/core/module_extensions.rb
new file mode 100644
index 0000000000..46285ccad0
--- /dev/null
+++ b/lib/rspec/core/module_extensions.rb
@@ -0,0 +1,16 @@
+module RSpec
+  module Core
+    module ModuleExtensions
+      unless respond_to?(:module_exec)
+        def module_exec(*args, &prc)
+          instance_exec(*args, &prc)
+        end
+        alias_method :class_exec, :module_exec
+      end
+    end
+  end
+end
+
+class Module
+  include RSpec::Core::ModuleExtensions
+end