diff --git a/guard-jasmine-headless-webkit.gemspec b/guard-jasmine-headless-webkit.gemspec
index bf92f40..d8b66de 100644
--- a/guard-jasmine-headless-webkit.gemspec
+++ b/guard-jasmine-headless-webkit.gemspec
@@ -18,4 +18,6 @@ Gem::Specification.new do |s|
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ["lib"]
+
+  s.add_dependency 'guard', '>= 0.2.2'
 end