diff --git a/rspec-nagios-formatter.gemspec b/rspec-nagios-formatter.gemspec
index a1b31ab..2fa0efd 100644
--- a/rspec-nagios-formatter.gemspec
+++ b/rspec-nagios-formatter.gemspec
@@ -14,7 +14,6 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = ">= 1.8.7"
   s.add_runtime_dependency("rspec-core", ">= 2.0.0")
-  s.add_runtime_dependency("open3_backport", ">= 0.0.3")
   s.add_development_dependency("rspec", ">= 2.0.0")
   s.add_development_dependency("rspec-expectations", ">= 2.0.0")
   s.add_development_dependency("rspec-mocks", ">= 2.0.0")