diff --git a/media/gpu/vp9_reference_frame_vector.cc b/media/gpu/vp9_reference_frame_vector.cc
index dc279980e..d560c7295 100644
--- a/media/gpu/vp9_reference_frame_vector.cc
+++ b/media/gpu/vp9_reference_frame_vector.cc
@@ -6,6 +6,8 @@
 
 #include "media/gpu/vp9_picture.h"
 
+#include <bitset>
+
 namespace media {
 
 Vp9ReferenceFrameVector::Vp9ReferenceFrameVector() {