diff --git a/src/game/boe.town.cpp b/src/game/boe.town.cpp
index 92af62f4..51b34415 100644
--- a/src/game/boe.town.cpp
+++ b/src/game/boe.town.cpp
@@ -1542,13 +1542,13 @@ void draw_map(bool need_refresh, std::string tooltip_text) {
 		// Draw signs
 		const std::vector<sign_loc_t>& sign_locs = is_out() ? univ.out->sign_locs : univ.town->sign_locs;
 		for(sign_loc_t sign : sign_locs){
-			mark_loc(sign, Colours::TRANSPARENT, Colours::YELLOW);
+			mark_loc(sign, Colours::EMPTY, Colours::YELLOW);
 		}
 		// Draw town entrances
 		if(is_out()){
 			const std::vector<spec_loc_t>& city_locs = univ.out->city_locs;
 			for(spec_loc_t city : city_locs){
-				mark_loc(city, Colours::TRANSPARENT, Colours::GREEN);
+				mark_loc(city, Colours::EMPTY, Colours::GREEN);
 			}
 		}
 		// Draw vehicles
diff --git a/src/gfx/render_shapes.hpp b/src/gfx/render_shapes.hpp
index 3ae03c84..62393535 100644
--- a/src/gfx/render_shapes.hpp
+++ b/src/gfx/render_shapes.hpp
@@ -58,7 +58,8 @@ namespace Colours {
 	const sf::Color YELLOW { 0xff, 0xff, 0x31};
 	const sf::Color ORANGE { 0xff, 0x80, 0x00};
 	const sf::Color LIGHT_BLUE { 0xad, 0xd8, 0xe6 }; // Spell points on dark background
-	const sf::Color TRANSPARENT { 0x00, 0x00, 0x00, 0x00 };
+	// On Windows, TRANSPARENT is macro-defined as something...?
+	const sf::Color EMPTY { 0x00, 0x00, 0x00, 0x00 };
 	// Text colours for shopping / talking
 	// TODO: The Windows version appears to use completely different colours?
 	const sf::Color SHADOW      { 0x00, 0x00, 0x68}; // formerly c[3] QD colour = {0,0,26623} (shop/character name shadow, shop subtitle)