diff --git a/lib/mixlib/install.rb b/lib/mixlib/install.rb
index cfc636be..fbb21933 100644
--- a/lib/mixlib/install.rb
+++ b/lib/mixlib/install.rb
@@ -18,7 +18,7 @@
 #
 
 require "mixlib/versioning"
-require "mixlib/shellout"
+require "mixlib/shellout" unless defined?(Mixlib::ShellOut)
 
 require_relative "install/backend"
 require_relative "install/options"
diff --git a/lib/mixlib/install/backend/package_router.rb b/lib/mixlib/install/backend/package_router.rb
index 2fc09f99..57578b71 100644
--- a/lib/mixlib/install/backend/package_router.rb
+++ b/lib/mixlib/install/backend/package_router.rb
@@ -16,7 +16,7 @@
 # limitations under the License.
 #
 
-require "json"
+require "json" unless defined?(JSON)
 require_relative "../artifact_info"
 require_relative "base"
 require_relative "../product"
@@ -24,7 +24,7 @@
 require_relative "../util"
 require_relative "../dist"
 require "mixlib/versioning"
-require "net/http"
+require "net/http" unless defined?(Net::HTTP)
 
 module Mixlib
   class Install
diff --git a/lib/mixlib/install/cli.rb b/lib/mixlib/install/cli.rb
index 8a54688a..eb1a79d1 100644
--- a/lib/mixlib/install/cli.rb
+++ b/lib/mixlib/install/cli.rb
@@ -13,7 +13,7 @@
 #
 
 require_relative "../install"
-require "thor"
+require "thor" unless defined?(Thor)
 
 module Mixlib
   class Install
diff --git a/lib/mixlib/install/generator/base.rb b/lib/mixlib/install/generator/base.rb
index e9792e7a..b6adf071 100644
--- a/lib/mixlib/install/generator/base.rb
+++ b/lib/mixlib/install/generator/base.rb
@@ -15,8 +15,8 @@
 # limitations under the License.
 #
 
-require "erb"
-require "ostruct"
+require "erb" unless defined?(Erb)
+require "ostruct" unless defined?(OpenStruct)
 require_relative "../util"
 require_relative "../dist"