diff --git a/desktop_version/src/Map.cpp b/desktop_version/src/Map.cpp
index 406bee9b..bcac820f 100644
--- a/desktop_version/src/Map.cpp
+++ b/desktop_version/src/Map.cpp
@@ -82,6 +82,8 @@ mapclass::mapclass(void)
 	cameraseek = 0;
 	minitowermode = false;
 	roomtexton = false;
+
+	nexttowercolour_set = false;
 }
 
 //Areamap starts at 100,100 and extends 20x20
@@ -631,6 +633,13 @@ void mapclass::updatetowerglow(TowerBG& bg_obj)
 
 void mapclass::nexttowercolour(void)
 {
+	/* Prevent cycling title BG more than once per frame. */
+	if (nexttowercolour_set)
+	{
+		return;
+	}
+	nexttowercolour_set = true;
+
 	graphics.titlebg.colstate+=5;
 	if (graphics.titlebg.colstate >= 30) graphics.titlebg.colstate = 0;
 
diff --git a/desktop_version/src/Map.h b/desktop_version/src/Map.h
index 796c3833..cf7814d5 100644
--- a/desktop_version/src/Map.h
+++ b/desktop_version/src/Map.h
@@ -55,6 +55,7 @@ public:
     void updatetowerglow(TowerBG& bg_obj);
 
     void nexttowercolour(void);
+    bool nexttowercolour_set;
 
     void settowercolour(int t);
 
diff --git a/desktop_version/src/main.cpp b/desktop_version/src/main.cpp
index bbf4806c..af7af8c6 100644
--- a/desktop_version/src/main.cpp
+++ b/desktop_version/src/main.cpp
@@ -724,7 +724,7 @@ static void unfocused_run(void)
 
 static void focused_begin(void)
 {
-    /* no-op. */
+    map.nexttowercolour_set = false;
 }
 
 static void focused_end(void)