diff --git a/DrmHwcTwo.h b/DrmHwcTwo.h
index 7fd4fbd..eb74f32 100644
--- a/DrmHwcTwo.h
+++ b/DrmHwcTwo.h
@@ -22,6 +22,7 @@
 
 #include <array>
 #include <map>
+#include <optional>
 
 #include "compositor/DrmDisplayCompositor.h"
 #include "compositor/Planner.h"
@@ -347,6 +348,8 @@
 
     DrmHwcTwo *hwc2_;
 
+    std::optional<DrmMode> staged_mode;
+
     ResourceManager *resource_manager_;
     DrmDevice *drm_;
     DrmDisplayCompositor compositor_;