diff --git a/multipart/__init__.py b/multipart/__init__.py
index 212af4e..f28c0c3 100644
--- a/multipart/__init__.py
+++ b/multipart/__init__.py
@@ -16,5 +16,5 @@
         spec.loader.exec_module(module)
         break
 else:
-    warnings.warn("Please use `import python_multipart` instead.", FutureWarning, stacklevel=2)
+    warnings.warn("Please use `import python_multipart` instead.", PendingDeprecationWarning, stacklevel=2)
     from python_multipart import *
diff --git a/noxfile.py b/noxfile.py
index 1df0fd7..20de33e 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -7,21 +7,25 @@
 
 
 @nox.session
-def rename(session: nox.Session) -> None:
-    session.install(".")
-    assert "import python_multipart" in session.run("python", "-c", "import multipart", silent=True)
-    assert "import python_multipart" in session.run("python", "-c", "import multipart.exceptions", silent=True)
-    assert "import python_multipart" in session.run("python", "-c", "from multipart import exceptions", silent=True)
+@nox.parametrize("editable", [True, False])
+def rename(session: nox.Session, editable: bool) -> None:
+    session.install("-e." if editable else ".")
+    # Ensure warning is not visible by default
+    assert "import python_multipart" not in session.run("python", "-c", "import multipart", silent=True)
+
+    assert "import python_multipart" in session.run("python", "-Wdefault", "-c", "import multipart", silent=True)
+    assert "import python_multipart" in session.run("python", "-Wdefault", "-c", "import multipart.exceptions", silent=True)
+    assert "import python_multipart" in session.run("python", "-Wdefault", "-c", "from multipart import exceptions", silent=True)
     assert "import python_multipart" in session.run(
-        "python", "-c", "from multipart.exceptions import FormParserError", silent=True
+        "python", "-Wdefault", "-c", "from multipart.exceptions import FormParserError", silent=True
     )
 
     session.install("multipart")
     assert "import python_multipart" not in session.run(
-        "python", "-c", "import multipart; multipart.parse_form_data", silent=True
+        "python", "-Wdefault", "-c", "import multipart; multipart.parse_form_data", silent=True
     )
     assert "import python_multipart" not in session.run(
-        "python", "-c", "import python_multipart; python_multipart.parse_form", silent=True
+        "python", "-Wdefault", "-c", "import python_multipart; python_multipart.parse_form", silent=True
     )
 
 
@@ -30,6 +34,7 @@ def rename_inline(session: nox.Session) -> None:
     session.install("pip")
     res = session.run(
         "python",
+        "-Wdefault",
         "-c",
         inspect.cleandoc("""
         import subprocess
@@ -40,4 +45,4 @@ def rename_inline(session: nox.Session) -> None:
     """),
         silent=True,
     )
-    assert "FutureWarning: Please use `import python_multipart` instead." in res
+    assert "Please use `import python_multipart` instead." in res