diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 9cdc1cefe..25d662d05 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -4935,6 +4935,7 @@ bool FurnaceGUI::loop() {
                 break;
               }
               case DIV_SYSTEM_GB:
+              case DIV_SYSTEM_SWAN:
               case DIV_SYSTEM_YM2610:
               case DIV_SYSTEM_YM2610_EXT:
               case DIV_SYSTEM_YM2610_FULL: