diff --git a/tests/debug/session.py b/tests/debug/session.py
index 56c093e2..21caeeba 100644
--- a/tests/debug/session.py
+++ b/tests/debug/session.py
@@ -350,13 +350,9 @@ class Session(object):
             env.pop("COV_CORE_SOURCE", None)
 
         return env
-    
+
     def _make_python_cmdline(self, exe, *args):
-        cmd = [exe]
-        if sys.version_info[:2] >= (3, 11):
-            cmd += ["-X", "frozen_modules=off"]
-        cmd += [str(s.strpath if isinstance(s, py.path.local) else s) for s in args]
-        return cmd
+        return [str(s.strpath if isinstance(s, py.path.local) else s) for s in [exe, *args]]
 
     def spawn_debuggee(self, args, cwd=None, exe=sys.executable, setup=None):
         assert self.debuggee is None
diff --git a/tox.ini b/tox.ini
index 0ee24403..670cedda 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@ passenv = DEBUGPY_LOG_DIR,DEBUGPY_TESTS_FULL
 setenv =
     DEBUGPY_TEST=1
 commands =
-    !py312-!cov: python -m pytest {posargs}
-    !py312-cov: python -m pytest --cov --cov-append --cov-config=.coveragerc {posargs}
-    py312-!cov: python -Xfrozen_modules=off -m pytest {posargs}
-    py312-cov: python -Xfrozen_modules=off -m pytest --cov --cov-append --cov-config=.coveragerc {posargs}
+    py{37,38,39}-!cov: python -m pytest {posargs}
+    py{37,38,39}-cov: python -m pytest --cov --cov-append --cov-config=.coveragerc {posargs}
+    py{310,311,312}-!cov: python -Xfrozen_modules=off -m pytest {posargs}
+    py{310,311,312}-cov: python -Xfrozen_modules=off -m pytest --cov --cov-append --cov-config=.coveragerc {posargs}