diff --git a/vagrant.gemspec b/vagrant.gemspec
index a981326f8..61ae0055c 100644
--- a/vagrant.gemspec
+++ b/vagrant.gemspec
@@ -31,6 +31,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "posix-spawn", "~> 0.3.6"
   s.add_development_dependency "sys-proctable", "~> 0.9.1"
   s.add_development_dependency "rspec-core", "~> 2.7.1"
+  s.add_development_dependency "rspec-expectations", "~> 2.7.0"
   s.add_development_dependency "rspec-mocks", "~> 2.7.0"
 
   s.files         = `git ls-files`.split("\n")