diff --git a/src/gui/subSongs.cpp b/src/gui/subSongs.cpp
index b21861251..ec6464466 100644
--- a/src/gui/subSongs.cpp
+++ b/src/gui/subSongs.cpp
@@ -53,6 +53,7 @@ void FurnaceGUI::drawSubSongs(bool asChild) {
           ImGui::PushID(i);
           if (ImGui::SmallButton(ICON_FA_ARROW_UP "##SubUp")) {
             e->moveSubSongUp(i);
+            MARK_MODIFIED;
           }
           if (ImGui::IsItemHovered()) {
             ImGui::SetTooltip(_("Move up"));
@@ -60,6 +61,7 @@ void FurnaceGUI::drawSubSongs(bool asChild) {
           ImGui::SameLine();
           if (ImGui::SmallButton(ICON_FA_ARROW_DOWN "##SubDown")) {
             e->moveSubSongDown(i);
+            MARK_MODIFIED;
           }
           if (ImGui::IsItemHovered()) {
             ImGui::SetTooltip(_("Move down"));