diff --git a/tests/test_process_tests.py b/tests/test_process_tests.py
index 59200d7..5e75b09 100644
--- a/tests/test_process_tests.py
+++ b/tests/test_process_tests.py
@@ -1,5 +1,6 @@
 import os
 import re
+import sys
 import socket
 
 import pytest
@@ -13,7 +14,7 @@
 
 
 def test_wait_for_strings():
-    with TestProcess('python', '-c', 'print("foobar")') as proc:
+    with TestProcess(sys.executable, '-c', 'print("foobar")') as proc:
         wait_for_strings(proc.read, TIMEOUT, 'foobar')
         with pytest.raises(AssertionError):
             with dump_on_error(proc.read):
@@ -22,7 +23,7 @@ def test_wait_for_strings():
 
 def test_filebuffer(tmp_path):
     with tmp_path.joinpath('stdout').open('wb') as fh:
-        with TestProcess('python', '-c', 'print("foobar")', stdout=fh) as proc:
+        with TestProcess(sys.executable, '-c', 'print("foobar")', stdout=fh) as proc:
             wait_for_strings(proc.read, TIMEOUT, 'foobar')
             with pytest.raises(AssertionError):
                 with dump_on_error(proc.read):
@@ -30,7 +31,7 @@ def test_filebuffer(tmp_path):
 
 
 def test_socket():
-    with TestProcess('python', '-mhttp.server', '0') as proc:
+    with TestProcess(sys.executable, '-mhttp.server', '0') as proc:
         with dump_on_error(proc.read, 'SERVER'):
             wait_for_strings(proc.read, TIMEOUT, 'Serving HTTP on')
             (port,) = re.match(r'Serving HTTP on .*? port (\d+) ', proc.read()).groups()