diff --git a/eessi/testsuite/tests/libraries/mpi4py/src/mpi4py_reduce.py b/eessi/testsuite/tests/libraries/mpi4py/src/mpi4py_reduce.py
index fc29781a..d37f4bdf 100644
--- a/eessi/testsuite/tests/libraries/mpi4py/src/mpi4py_reduce.py
+++ b/eessi/testsuite/tests/libraries/mpi4py/src/mpi4py_reduce.py
@@ -35,7 +35,7 @@
 for i in range(n_iter):
     total = MPI.COMM_WORLD.reduce(rank)
 t2 = time.time()
-total_time = (t2-t1)/n_iter
+total_time = (t2 - t1) / n_iter
 
 if rank == 0:
     print(f"Total ranks: {size}")