diff --git a/include/mgba/internal/gba/video.h b/include/mgba/internal/gba/video.h
index e3a6a6291..45481c3a4 100644
--- a/include/mgba/internal/gba/video.h
+++ b/include/mgba/internal/gba/video.h
@@ -104,8 +104,8 @@ union GBAOAM {
 };
 
 struct GBAVideoWindowRegion {
-	uint8_t end;
-	uint8_t start;
+	uint16_t end;
+	uint16_t start;
 };
 
 #define GBA_TEXT_MAP_TILE(MAP) ((MAP) & 0x03FF)