diff --git a/resources/rubygems/operating_system.rb b/resources/rubygems/operating_system.rb
index c307958c..f10db341 100755
--- a/resources/rubygems/operating_system.rb
+++ b/resources/rubygems/operating_system.rb
@@ -1,6 +1,6 @@
 # :DK-BEG: missing DevKit/build tool convenience notice
 Gem.pre_install do |gem_installer|
-  unless gem_installer.spec.extensions.empty?
+  unless gem_installer.spec.extensions.reject { |extension| /mkrf_conf/ === extension }.empty?
     begin
       load 'devkit'
     rescue LoadError