diff --git a/dom/ipc/MemMapSnapshot.h b/dom/ipc/MemMapSnapshot.h
index 1a17e9c9afda..12b4d353ad4f 100644
--- a/dom/ipc/MemMapSnapshot.h
+++ b/dom/ipc/MemMapSnapshot.h
@@ -12,6 +12,7 @@
 #include "mozilla/RangedPtr.h"
 #include "mozilla/Result.h"
 #include "base/shared_memory.h"
+#include "ErrorList.h"
 
 namespace mozilla {
 namespace loader {