diff --git a/src/map_location.cpp b/src/map_location.cpp
index 1a6eef36842c..48c1d0db1b27 100644
--- a/src/map_location.cpp
+++ b/src/map_location.cpp
@@ -215,8 +215,8 @@ map_location::DIRECTION map_location::get_relative_dir(map_location loc) const
 	if (dx==0 && dy==0) return NDIRECTIONS;
 
 	int dist = abs(dx);                                   // Distance from north-south line
-	int dist_diag_SW_NE = abs(dy + (dx + (dy>0?0:1) )/2); // Distance from diagonal line SE-NW
-	int dist_diag_SE_NW = abs(dy - (dx - (dy>0?0:1) )/2); // Distance from diagonal line SW-NE
+	int dist_diag_SW_NE = abs(dy + (dx + (dy>0?0:1) )/2); // Distance from diagonal line SW-NE
+	int dist_diag_SE_NW = abs(dy - (dx - (dy>0?0:1) )/2); // Distance from diagonal line SE-NW
 	
 	if (dy > 0) dir = SOUTH;
 	else        dir = NORTH;