diff --git a/src/core/types.h b/src/core/types.h
index c1a281064..c288c1916 100644
--- a/src/core/types.h
+++ b/src/core/types.h
@@ -87,6 +87,7 @@ enum class DisplayAspectRatio : u8
 {
   R4_3,
   R16_9,
+  R21_9,
   R8_7,
   R2_1,
   R1_1,