diff --git a/test/test_environment.py b/test/test_environment.py
index 079081ce..97326549 100644
--- a/test/test_environment.py
+++ b/test/test_environment.py
@@ -1,5 +1,6 @@
 import os
 import subprocess
+import sys
 import textwrap
 
 import pytest
@@ -33,7 +34,7 @@ project_with_environment_asserts = test_projects.new_c_project(
 
 
 def test(tmp_path):
-    python_echo = 'python -c "import sys; print(*sys.argv[1:])"'
+    python_echo = f'"{sys.executable}" -c "import sys; print(*sys.argv[1:])"'
     project_dir = tmp_path / "project"
     project_with_environment_asserts.generate(project_dir)
 
diff --git a/unit_test/environment_test.py b/unit_test/environment_test.py
index 696dff63..3161a294 100644
--- a/unit_test/environment_test.py
+++ b/unit_test/environment_test.py
@@ -1,8 +1,9 @@
 import os
+import sys
 
 from cibuildwheel.environment import parse_environment
 
-PYTHON_ECHO = 'python -c "import sys; print(*sys.argv[1:])"'
+PYTHON_ECHO = f'"{sys.executable}" -c "import sys; print(*sys.argv[1:])"'
 
 
 def test_basic_parsing():