diff --git a/tests/test_tutorial/test_subcommands/test_tutorial001.py b/tests/test_tutorial/test_subcommands/test_tutorial001.py
index 4e8b23ec30..0b40ab7f68 100644
--- a/tests/test_tutorial/test_subcommands/test_tutorial001.py
+++ b/tests/test_tutorial/test_subcommands/test_tutorial001.py
@@ -87,7 +87,10 @@ def test_scripts(mod):
     from docs_src.subcommands.tutorial001_py310 import items, users
 
     env = os.environ.copy()
-    env["PYTHONPATH"] = ":".join(list(tutorial001_py310.__path__))
+    env["PYTHONPATH"] = ":".join(
+        list(tutorial001_py310.__path__)
+        + ([env["PYTHONPATH"]] if "PYTHONPATH" in env else [])
+    )
 
     for module in [mod, items, users]:
         result = subprocess.run(
diff --git a/tests/test_tutorial/test_subcommands/test_tutorial003.py b/tests/test_tutorial/test_subcommands/test_tutorial003.py
index 30b43526fd..756e582bd2 100644
--- a/tests/test_tutorial/test_subcommands/test_tutorial003.py
+++ b/tests/test_tutorial/test_subcommands/test_tutorial003.py
@@ -166,7 +166,10 @@ def test_scripts(mod):
     )
 
     env = os.environ.copy()
-    env["PYTHONPATH"] = ":".join(list(tutorial003_py310.__path__))
+    env["PYTHONPATH"] = ":".join(
+        list(tutorial003_py310.__path__)
+        + ([env["PYTHONPATH"]] if "PYTHONPATH" in env else [])
+    )
 
     for module in [mod, items, lands, reigns, towns, users]:
         result = subprocess.run(
diff --git a/tests/test_types_file.py b/tests/test_types_file.py
index 3fb7d82f69..734867d373 100644
--- a/tests/test_types_file.py
+++ b/tests/test_types_file.py
@@ -1,3 +1,4 @@
+import os
 import subprocess
 import sys
 from io import BytesIO, StringIO
@@ -9,6 +10,7 @@
 from typer._click.utils import PacifyFlushWrapper
 from typer.testing import CliRunner
 
+import tests
 from tests.utils import needs_linux, needs_windows
 
 app = typer.Typer()
@@ -136,6 +138,17 @@ def test_binary_dash() -> None:
 
 
 def test_binary_stderr() -> None:
+    env = os.environ.copy()
+    env.update(
+        {
+            "PYTHONPATH": ":".join(
+                [str(Path(tests.__path__[0]).parent)] + [env["PYTHONPATH"]]
+            )
+        }
+        if "PYTHONPATH" in env
+        else {}
+    )
+
     result = subprocess.run(
         [
             sys.executable,
@@ -146,6 +159,7 @@ def test_binary_stderr() -> None:
             "write-binary-stderr",
         ],
         capture_output=True,
+        env=env,
     )
     assert result.returncode == 0
     assert result.stderr == b"binary-stderr\n"