diff --git a/day-15/day-15.py b/day-15/day-15.py
index e103747..8a97582 100644
--- a/day-15/day-15.py
+++ b/day-15/day-15.py
@@ -11,7 +11,6 @@ def part_1(input):
     start = (0, 0)
     end = (x_size - 1, y_size - 1)
     cost = {start: 0}
-    prev = {start: None}
     queue = set([start])
     done = set()
     neighbors = set([(-1, 0), (0, -1), (0, 1), (1, 0)])
@@ -32,7 +31,6 @@ def part_1(input):
             next_cost = cur_cost + nodes[n]
             if not n in cost or next_cost < cost[n]:
                 cost[n] = next_cost
-                prev[n] = current
             queue.add(n)
         done.add(current)
     result = cost[end]
@@ -58,7 +56,6 @@ def part_2(input):
     start = (0, 0)
     end = ((x_size * repeat) - 1, (y_size * repeat) - 1)
     cost = {start: 0}
-    prev = {start: None}
     queue = set([start])
     done = set()
     neighbors = set([(-1, 0), (0, -1), (0, 1), (1, 0)])
@@ -81,7 +78,6 @@ def part_2(input):
             next_cost = cur_cost + nodes[n]
             if not n in cost or next_cost < cost[n]:
                 cost[n] = next_cost
-                prev[n] = current
             queue.add(n)
         done.add(current)
     result = cost[end]