diff --git a/scripts/src/emu.lua b/scripts/src/emu.lua
index 1b7492c1760..8043384a5a2 100644
--- a/scripts/src/emu.lua
+++ b/scripts/src/emu.lua
@@ -38,6 +38,18 @@ if _OPTIONS["with-bundled-lua"] then
 	}
 end
 
+if (_OPTIONS["targetos"] == "windows") then
+	defines {
+		"UI_WINDOWS",
+	}
+end
+
+if (_OPTIONS["osd"] == "sdl") then
+	defines {
+		"UI_SDL",
+	}
+end
+
 files {
 	MAME_DIR .. "src/emu/emu.h",
 	MAME_DIR .. "src/emu/gamedrv.h",
diff --git a/src/emu/ui/custui.cpp b/src/emu/ui/custui.cpp
index 47d983d5ef4..70176cf4708 100644
--- a/src/emu/ui/custui.cpp
+++ b/src/emu/ui/custui.cpp
@@ -141,7 +141,7 @@ void ui_menu_custom_ui::custom_render(void *selectedref, float top, float bottom
 ui_menu_font_ui::ui_menu_font_ui(running_machine &machine, render_container *container) : ui_menu(machine, container)
 {
 	emu_options &moptions = machine.options();
-#ifdef OSD_WINDOWS
+#ifdef UI_WINDOWS
 
 	std::string name(moptions.ui_font());
 	list();
@@ -180,7 +180,7 @@ ui_menu_font_ui::ui_menu_font_ui(running_machine &machine, render_container *con
 
 }
 
-#ifdef OSD_WINDOWS
+#ifdef UI_WINDOWS
 //-------------------------------------------------
 //  fonts enumerator CALLBACK
 //-------------------------------------------------
@@ -227,7 +227,7 @@ ui_menu_font_ui::~ui_menu_font_ui()
 	std::string error_string;
 	emu_options &moptions = machine().options();
 
-#ifdef OSD_WINDOWS
+#ifdef UI_WINDOWS
 	std::string name(m_fonts[m_actual]);
 	if (m_fonts[m_actual] != "default")
 	{
@@ -273,7 +273,7 @@ void ui_menu_font_ui::handle()
 				}
 				break;
 
-#ifdef OSD_WINDOWS
+#ifdef UI_WINDOWS
 
 			case MUI_FNT:
 				if (m_event->iptkey == IPT_UI_LEFT || m_event->iptkey == IPT_UI_RIGHT)
@@ -313,7 +313,7 @@ void ui_menu_font_ui::populate()
 	UINT32 arrow_flags;
 	std::string tmptxt;
 
-#ifdef OSD_WINDOWS
+#ifdef UI_WINDOWS
 	// add fonts option
 	arrow_flags = get_arrow_flags(0, m_fonts.size() - 1, m_actual);
 	std::string name(m_fonts[m_actual]);
diff --git a/src/emu/ui/custui.h b/src/emu/ui/custui.h
index 0c453340c18..79f45cc3a6e 100644
--- a/src/emu/ui/custui.h
+++ b/src/emu/ui/custui.h
@@ -13,7 +13,7 @@
 #ifndef __UI_CUSTUI_H__
 #define __UI_CUSTUI_H__
 
-#ifdef OSD_WINDOWS
+#ifdef UI_WINDOWS
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #endif
@@ -64,7 +64,7 @@ private:
 		MUI_ITALIC
 	};
 
-#ifdef OSD_WINDOWS
+#ifdef UI_WINDOWS
 	UINT16						m_actual;
 	std::vector<std::string>	m_fonts;
 	bool						m_bold, m_italic;
diff --git a/src/emu/ui/dsplmenu.cpp b/src/emu/ui/dsplmenu.cpp
index 88edd6466e7..a1907b89d51 100644
--- a/src/emu/ui/dsplmenu.cpp
+++ b/src/emu/ui/dsplmenu.cpp
@@ -15,7 +15,7 @@
 #include "ui/selector.h"
 #include "ui/utils.h"
 
-#if defined(OSD_WINDOWS) && !defined(OSD_SDL)
+#if defined(UI_WINDOWS) && !defined(UI_SDL)
 #include "../osd/windows/winmain.h"
 #else
 #include "../osd/modules/lib/osdobj_common.h"
@@ -24,7 +24,7 @@
 ui_menu_display_options::video_modes ui_menu_display_options::m_video[] = {
 	{ "auto",    "Auto" },
 	{ "opengl",  "OpenGL" },
-#if defined(OSD_WINDOWS) && !defined(OSD_SDL)
+#if defined(UI_WINDOWS) && !defined(UI_SDL)
 	{ "d3d",     "Direct3D" },
 	{ "gdi",     "GDI" },
 	{ "ddraw",   "DirectDraw" }
@@ -37,7 +37,7 @@ ui_menu_display_options::video_modes ui_menu_display_options::m_video[] = {
 ui_menu_display_options::dspl_option ui_menu_display_options::m_options[] = {
 	{ 0, nullptr, nullptr },
 	{ 0, "Video Mode",               OSDOPTION_VIDEO },
-#if defined(OSD_WINDOWS) && !defined(OSD_SDL)
+#if defined(UI_WINDOWS) && !defined(UI_SDL)
 	{ 0, "Hardware Stretch",         WINOPTION_HWSTRETCH },
 	{ 0, "Triple Buffering",         WINOPTION_TRIPLEBUFFER },
 	{ 0, "HLSL",                     WINOPTION_HLSL_ENABLE },
@@ -60,7 +60,7 @@ ui_menu_display_options::dspl_option ui_menu_display_options::m_options[] = {
 
 ui_menu_display_options::ui_menu_display_options(running_machine &machine, render_container *container) : ui_menu(machine, container)
 {
-#if defined(OSD_WINDOWS) && !defined(OSD_SDL)
+#if defined(UI_WINDOWS) && !defined(UI_SDL)
 	windows_options &options = downcast<windows_options &>(machine.options());
 #else
 	osd_options &options = downcast<osd_options &>(machine.options());