diff --git a/day-13/day-13.py b/day-13/day-13.py
index 6fd0457..536b776 100644
--- a/day-13/day-13.py
+++ b/day-13/day-13.py
@@ -27,7 +27,7 @@ def part_1(input):
             dots.add((int(x), int(y)))
         elif 'fold along' in line:
             d, c = line.strip().split()[-1].split('=')
-            instructions.append([d, int(c)])
+            instructions.append((d, int(c)))
     dots = fold(instructions.pop(0), dots)
     result = len(dots)
     print("Part 1 result:", result)
@@ -43,7 +43,7 @@ def part_2(input):
             dots.add((int(x), int(y)))
         elif 'fold along' in line:
             d, c = line.strip().split()[-1].split('=')
-            instructions.append([d, int(c)])
+            instructions.append((d, int(c)))
 
     while len(instructions):
         dots = fold(instructions.pop(0), dots)