diff --git a/honeybadger.gemspec b/honeybadger.gemspec
index b43f20e6..ba219580 100644
--- a/honeybadger.gemspec
+++ b/honeybadger.gemspec
@@ -36,4 +36,5 @@ Gem::Specification.new do |s|
   s.executables << 'honeybadger'
 
   s.add_dependency 'logger'
+  s.add_dependency 'ostruct'
 end