diff --git a/lib/Board.cpp b/lib/Board.cpp
index c5d8c0f..9a169ba 100644
--- a/lib/Board.cpp
+++ b/lib/Board.cpp
@@ -63,11 +63,11 @@ bool isWalkableForPacMan(GridPosition point) {
   return cellAtPosition(point) != Cell::wall && cellAtPosition(point) != Cell::pen;
 }
 
-bool isWalkableForGhost(GridPosition point, GridPosition origin, bool isEyes) {
-  const Cell cell = cellAtPosition(point);
+bool isWalkableForGhost(GridPosition target_position, GridPosition current_position, bool isEyes) {
+  const Cell cell = cellAtPosition(target_position);
   if (cell == Cell::wall)
     return false;
-  return isEyes || isInPen(origin) || !isInPen(point);
+  return isEyes || isInPen(current_position) || !isInPen(target_position);
 }
 
 bool isInPen(GridPosition point) {
diff --git a/lib/include/Board.hpp b/lib/include/Board.hpp
index ebacf0a..ae24e7b 100644
--- a/lib/include/Board.hpp
+++ b/lib/include/Board.hpp
@@ -9,7 +9,7 @@
 namespace pacman {
 
 bool isWalkableForPacMan(GridPosition point);
-bool isWalkableForGhost(GridPosition point, GridPosition origin, bool isEyes);
+bool isWalkableForGhost(GridPosition target_position, GridPosition current_position, bool isEyes);
 bool isInPen(GridPosition point);
 bool isPortal(GridPosition point, Direction direction);
 bool isIntersection(GridPosition point);