diff --git a/game/scripts/minigames/puzzle.rpy b/game/scripts/minigames/puzzle.rpy
index 22e446fa..db7a1855 100644
--- a/game/scripts/minigames/puzzle.rpy
+++ b/game/scripts/minigames/puzzle.rpy
@@ -23,7 +23,7 @@ init python:
             if (grid % 2 == 1):
                 is_solvable = (inversions % 2 == 0)
             else:
-                blank_row = grid - (puzzle.index(blank) / grid)
+                blank_row = grid - (puzzle.index(blank) // grid)
                 is_solvable = (inversions % 2 != blank_row % 2)
 
             too_difficult = (inversions <= difficulty)