diff --git a/phasecalculator/runners/phasetransferrunner.py b/phasecalculator/runners/phasetransferrunner.py
index 673310b769cb617cebc5857c187c34a5d42630de..15cdbbc76521cb7569fd3105502489671edcba69 100755
--- a/phasecalculator/runners/phasetransferrunner.py
+++ b/phasecalculator/runners/phasetransferrunner.py
@@ -23,6 +23,7 @@ Script for running phasetransfer calculations.
 import logging
 import subprocess
 import pathlib
+import sys
 import puresolventinformation.information as pureinf
 
 logging.basicConfig()
@@ -165,7 +166,7 @@ def run_calculation(arg_list):
         result of system call.
 
     """
-    return subprocess.run(arg_list,capture_output=True)
+    return subprocess.run(arg_list, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
 
 
 def generate_vle_calc_args(jar_path, phase_filename, output_filename, **kwargs):