diff --git a/src/sys/nact_sys1.cpp b/src/sys/nact_sys1.cpp
index 00c774a..7a47919 100644
--- a/src/sys/nact_sys1.cpp
+++ b/src/sys/nact_sys1.cpp
@@ -444,7 +444,7 @@ void NACT_Sys1::exec_y(int cmd, int param)
 	case 4:
 		RND = (param == 0 || param == 1) ? 0 : random(param);
 		break;
-	case 240:
+	case 240:  // System3-sdl2 extension
 		ags->draw_hankaku = (param == 1) ? true : false;
 		break;
 	case 253:
diff --git a/src/sys/nact_sys2.cpp b/src/sys/nact_sys2.cpp
index f0f25db..525ebf0 100644
--- a/src/sys/nact_sys2.cpp
+++ b/src/sys/nact_sys2.cpp
@@ -784,6 +784,9 @@ void NACT_Sys2::cmd_y()
 				}
 			}
 			break;
+		case 240:  // System3-sdl2 extension
+			ags->draw_hankaku = (param == 1) ? true : false;
+			break;
 		case 252:
 			RND = 8;
 			break;