diff --git a/examples/simulation/implicit_mass_spring.py b/examples/simulation/implicit_mass_spring.py
index 0b966b9dbe00b2..6a71257633e4ba 100644
--- a/examples/simulation/implicit_mass_spring.py
+++ b/examples/simulation/implicit_mass_spring.py
@@ -1,7 +1,8 @@
 # https://www.cs.cmu.edu/~baraff/papers/sig98.pdf
-import taichi as ti
 import numpy as np
 
+import taichi as ti
+
 
 @ti.data_oriented
 class Cloth: