diff --git a/src/inline_snapshot/testing/_example.py b/src/inline_snapshot/testing/_example.py
index b511acf..82b268d 100644
--- a/src/inline_snapshot/testing/_example.py
+++ b/src/inline_snapshot/testing/_example.py
@@ -134,6 +134,7 @@ def _subprocess_env() -> dict[str, str]:
         "PYTHONIOENCODING",
         "PYTEST_DISABLE_PLUGIN_AUTOLOAD",
         "PYTEST_PLUGINS",
+        "PYTHONWARNINGS",
     ]
     if platform.system() == "Windows":  # pragma: no cover
         env_keys.extend(