diff --git a/aoc.py b/aoc.py
index ee3781f..b7236ca 100644
--- a/aoc.py
+++ b/aoc.py
@@ -75,7 +75,7 @@ class AOCDay:
         """
         get input for day x as 2d array, split by empty lines
         """
-        lines = self.input
+        lines = self.input.copy()
         lines.append('')
 
         return_array = []