diff --git a/src/xenia/ui/imgui_drawer.h b/src/xenia/ui/imgui_drawer.h
index 6009ebdf1..f5057f403 100644
--- a/src/xenia/ui/imgui_drawer.h
+++ b/src/xenia/ui/imgui_drawer.h
@@ -13,6 +13,7 @@
 #include <cstddef>
 #include <cstdint>
 #include <memory>
+#include <optional>
 #include <vector>
 
 #include "xenia/ui/immediate_drawer.h"