diff --git a/bin/solve_maze.py b/bin/solve_maze.py
index ccb8957..8811755 100644
--- a/bin/solve_maze.py
+++ b/bin/solve_maze.py
@@ -2,8 +2,10 @@ import sys
 
 from maze import parse_maze
 
+
 if len(sys.argv) == 2:
     m = parse_maze(open(sys.argv[1], 'r').read())
 else:
     m = parse_maze(sys.stdin.read())
+sys.setrecursionlimit(m._size * 1000)
 print m.solve()
diff --git a/maze/__init__.py b/maze/__init__.py
index bf05e8c..fff42bc 100644
--- a/maze/__init__.py
+++ b/maze/__init__.py
@@ -12,7 +12,7 @@ class CS235Maze(object):
         self._data = data
         self._size = len(data)
 
-    def _solve(self, x, y, z, path=None):
+    def _solve(self, x, y, z, path):
         if x < 0 or y < 0 or z < 0 or \
                 x >= self._size or y >= self._size or z >= self._size:
             return False