diff --git a/active_projects/eola2/determinant_puzzle.py b/active_projects/eola2/determinant_puzzle.py
index 6f335463..aeda8480 100644
--- a/active_projects/eola2/determinant_puzzle.py
+++ b/active_projects/eola2/determinant_puzzle.py
@@ -98,7 +98,7 @@ class WorkOutNumerically(Scene):
             non_numbers = VGroup(*[m for m in det if m not in numbers])
             matrix_numbers = VGroup(*[
                 matrix.mob_matrix[i][j].copy()
-                for i, j in (0, 0), (1, 1), (0, 1), (1, 0)
+                for i, j in ((0, 0), (1, 1), (0, 1), (1, 0))
             ])
             self.play(
                 LaggedStart(FadeIn, non_numbers, run_time=1),