diff --git a/tests/population/multiprocessing_via_population_comparison.py b/tests/population/multiprocessing_via_population_comparison.py
index 2fca56d4ed3e27aec6b82f0cb067f53903bf53a3..600e88847b38ff5bef71cb61831b2b7d599d346e 100644
--- a/tests/population/multiprocessing_via_population_comparison.py
+++ b/tests/population/multiprocessing_via_population_comparison.py
@@ -3,6 +3,7 @@ import json
 import time
 import pickle
 import sys
+import numpy as np
 
 import matplotlib.pyplot as plt
 
@@ -112,7 +113,7 @@ test_pop.set(
 res = test_pop.evolve_population_comparison(
     parse_function, amt=int(amt_systems), nodes=int(amt_nodes)
 )
-with open("comparison_result.dat", "a") as f:
+with open("comparison_result_{}.dat".format(name_testcase), "a") as f:
     f.write(str(res) + "\n")