diff --git a/mlx90640/mlx90640_lcd_display.c b/mlx90640/mlx90640_lcd_display.c
index e460df6..5a4ff74 100644
--- a/mlx90640/mlx90640_lcd_display.c
+++ b/mlx90640/mlx90640_lcd_display.c
@@ -210,7 +210,7 @@ static void sortFocusAreas(void)
 			{
 				temp1  = (float)tempValues[(x)   + (y*COL)];
 
-				if ((temp1 + (float)(waterTempThreshold / 10.0)) <  (float)env_temperature )   // was max(averageTemp, env_temperature))
+				if ((temp1 + (float)(waterTempThreshold / 10.0)) <  (float)(min(averageTemp, env_temperature)))   // was max(averageTemp, env_temperature))
 				{
 					if (blackOutTag == 0) {
 						zoneMask[y*COL+x] ++;