diff --git a/rpcs3/Emu/Io/Dimensions.h b/rpcs3/Emu/Io/Dimensions.h
index 34a88fa567..84c578c1a8 100644
--- a/rpcs3/Emu/Io/Dimensions.h
+++ b/rpcs3/Emu/Io/Dimensions.h
@@ -3,6 +3,7 @@
 #include "Emu/Io/usb_device.h"
 #include "Utilities/mutex.h"
 #include <array>
+#include <optional>
 #include <queue>
 
 struct dimensions_figure