diff --git a/lib/facebook_ads/ad_objects/server_side/event_request.rb b/lib/facebook_ads/ad_objects/server_side/event_request.rb
index 0bcdb35c..e79ca209 100644
--- a/lib/facebook_ads/ad_objects/server_side/event_request.rb
+++ b/lib/facebook_ads/ad_objects/server_side/event_request.rb
@@ -17,6 +17,7 @@
 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 require 'json'
+require 'ostruct'
 
 require_relative './event'
 require_relative './event_response'