diff --git a/src/gui/gui.h b/src/gui/gui.h
index 5cd8ada8b..697821f87 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -352,6 +352,7 @@ enum FurnaceGUIColors {
   GUI_COLOR_INSTR_BIFURCATOR,
   GUI_COLOR_INSTR_SID2,
   GUI_COLOR_INSTR_SUPERVISION,
+  GUI_COLOR_INSTR_UPD1771C,
   GUI_COLOR_INSTR_UNKNOWN,
 
   GUI_COLOR_CHANNEL_BG,
diff --git a/src/gui/guiConst.cpp b/src/gui/guiConst.cpp
index e24f0d1ac..15dd2f356 100644
--- a/src/gui/guiConst.cpp
+++ b/src/gui/guiConst.cpp
@@ -1018,6 +1018,7 @@ const FurnaceGUIColorDef guiColors[GUI_COLOR_MAX]={
   D(GUI_COLOR_INSTR_BIFURCATOR,"",ImVec4(0.8925f,0.8925f,0.8925f,1.0f)),
   D(GUI_COLOR_INSTR_SID2,"",ImVec4(0.6f,0.75f,1.0f,1.0f)),
   D(GUI_COLOR_INSTR_SUPERVISION,"",ImVec4(0.52f,1.0f,0.6f,1.0f)),
+  D(GUI_COLOR_INSTR_UPD1771C,"",ImVec4(0.94f,0.52f,0.6f,1.0f)),
   D(GUI_COLOR_INSTR_UNKNOWN,"",ImVec4(0.3f,0.3f,0.3f,1.0f)),
 
   D(GUI_COLOR_CHANNEL_BG,"",ImVec4(0.4f,0.6f,0.8f,1.0f)),
diff --git a/src/gui/settings.cpp b/src/gui/settings.cpp
index 05b3d9643..093a6cbd8 100644
--- a/src/gui/settings.cpp
+++ b/src/gui/settings.cpp
@@ -4114,6 +4114,7 @@ void FurnaceGUI::drawSettings() {
           UI_COLOR_CONFIG(GUI_COLOR_INSTR_BIFURCATOR,_("Bifurcator"));
           UI_COLOR_CONFIG(GUI_COLOR_INSTR_SID2,_("SID2"));
           UI_COLOR_CONFIG(GUI_COLOR_INSTR_SUPERVISION,_("Supervision"));
+          UI_COLOR_CONFIG(GUI_COLOR_INSTR_UPD1771C,_("uPD1771C"));
           UI_COLOR_CONFIG(GUI_COLOR_INSTR_UNKNOWN,_("Other/Unknown"));
           ImGui::TreePop();
         }