diff --git a/quiche/quic/tools/quic_memory_cache_backend.h b/quiche/quic/tools/quic_memory_cache_backend.h
index 1738e3c..7dfd372 100644
--- a/quiche/quic/tools/quic_memory_cache_backend.h
+++ b/quiche/quic/tools/quic_memory_cache_backend.h
@@ -17,6 +17,7 @@
 #include "quiche/quic/tools/quic_backend_response.h"
 #include "quiche/quic/tools/quic_simple_server_backend.h"
 #include "quiche/quic/tools/quic_url.h"
+#include "quiche/spdy/core/http2_header_block.h"
 #include "quiche/spdy/core/spdy_framer.h"
 
 namespace quic {