diff --git a/dom/quota/PQuotaRequest.ipdl b/dom/quota/PQuotaRequest.ipdl
index 3e28d1cae1..3f0b2bc61f 100644
--- a/dom/quota/PQuotaRequest.ipdl
+++ b/dom/quota/PQuotaRequest.ipdl
@@ -3,6 +3,7 @@
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 include protocol PQuota;
+include "mozilla/dom/quota/SerializationHelpers.h";
 
 using mozilla::dom::quota::FullOriginMetadata
   from "mozilla/dom/quota/CommonMetadata.h";