diff --git a/README.md b/README.md
index 608526e..c1dcb97 100644
--- a/README.md
+++ b/README.md
@@ -126,11 +126,12 @@ result = differential_evolution(cost, bounds=[(-1, 1)], workers=AsyncFoamCase.ma
     
 ```python
 #!/usr/bin/env python3
+from pathlib import Path
 from foamlib import FoamCase
 
-this_case = FoamCase()
+case = FoamCase(Path(__file__).parent)
 # Any additional configuration here
-this_case.run()
+case.run()
 ```
 
 ## Documentation
diff --git a/foamlib/_cases/_async.py b/foamlib/_cases/_async.py
index b666bc5..9a359a9 100644
--- a/foamlib/_cases/_async.py
+++ b/foamlib/_cases/_async.py
@@ -41,7 +41,7 @@ class AsyncFoamCase(FoamCaseRunBase):
 
     Access the time directories of the case as a sequence, e.g. `case[0]` or `case[-1]`.
 
-    :param path: The path to the case directory. If None, use the current script's directory (if applicable), or the current working directory.
+    :param path: The path to the case directory.
     """
 
     class TimeDirectory(FoamCaseRunBase.TimeDirectory):
diff --git a/foamlib/_cases/_base.py b/foamlib/_cases/_base.py
index fbfe0a6..bec3307 100644
--- a/foamlib/_cases/_base.py
+++ b/foamlib/_cases/_base.py
@@ -25,6 +25,9 @@
 
 
 class FoamCaseBase(Sequence["FoamCaseBase.TimeDirectory"]):
+    def __init__(self, path: Union["os.PathLike[str]", str] = Path()):
+        self.path = Path(path).absolute()
+
     class TimeDirectory(Set[FoamFieldFile]):
         """
         An OpenFOAM time directory in a case.
@@ -92,15 +95,6 @@ def __repr__(self) -> str:
         def __str__(self) -> str:
             return str(self.path)
 
-    def __init__(self, path: Optional[Union["os.PathLike[str]", str]] = None):
-        if path is None:
-            if sys.argv[0]:
-                self.path = Path(sys.argv[0]).absolute().parent
-            else:
-                self.path = Path.cwd()
-        else:
-            self.path = Path(path).absolute()
-
     @property
     def _times(self) -> Sequence["FoamCaseBase.TimeDirectory"]:
         times = []
diff --git a/foamlib/_cases/_sync.py b/foamlib/_cases/_sync.py
index b1013e1..c77c9c2 100644
--- a/foamlib/_cases/_sync.py
+++ b/foamlib/_cases/_sync.py
@@ -29,7 +29,7 @@ class FoamCase(FoamCaseRunBase):
 
     Access the time directories of the case as a sequence, e.g. `case[0]` or `case[-1]`.
 
-    :param path: The path to the case directory. If None, use the current script's directory (if applicable), or the current working directory.
+    :param path: The path to the case directory.
     """
 
     class TimeDirectory(FoamCaseRunBase.TimeDirectory):
diff --git a/tests/test_cases/test_cavity.py b/tests/test_cases/test_cavity.py
index e007a3a..ec62ecf 100644
--- a/tests/test_cases/test_cavity.py
+++ b/tests/test_cases/test_cavity.py
@@ -27,7 +27,7 @@ def cavity(request: pytest.FixtureRequest) -> "Generator[FoamCase]":
             assert not run.exists()
             assert not (clone.path / "Allrun").exists()
             run.write_text(
-                "#!/usr/bin/env python3\nfrom foamlib import FoamCase\nFoamCase().run(parallel=False)"
+                "#!/usr/bin/env python3\nfrom pathlib import Path\nfrom foamlib import FoamCase\nFoamCase(Path(__file__).parent).run(parallel=False)"
             )
             run.chmod(run.stat().st_mode | stat.S_IEXEC)
 
@@ -35,7 +35,7 @@ def cavity(request: pytest.FixtureRequest) -> "Generator[FoamCase]":
             assert not clean.exists()
             assert not (clone.path / "Allclean").exists()
             clean.write_text(
-                "#!/usr/bin/env python3\nfrom foamlib import FoamCase\nFoamCase().clean()"
+                "#!/usr/bin/env python3\nfrom pathlib import Path\nfrom foamlib import FoamCase\nFoamCase(Path(__file__).parent).clean()"
             )
             clean.chmod(clean.stat().st_mode | stat.S_IEXEC)
 
diff --git a/tests/test_cases/test_cavity_async.py b/tests/test_cases/test_cavity_async.py
index d5a1f31..151d74f 100644
--- a/tests/test_cases/test_cavity_async.py
+++ b/tests/test_cases/test_cavity_async.py
@@ -28,7 +28,7 @@ async def cavity(request: pytest.FixtureRequest) -> "AsyncGenerator[AsyncFoamCas
             assert not run.exists()
             assert not (clone.path / "Allrun").exists()
             run.write_text(
-                "#!/usr/bin/env python3\nfrom foamlib import FoamCase\nFoamCase().run(parallel=False)"
+                "#!/usr/bin/env python3\nfrom pathlib import Path\nfrom foamlib import FoamCase\nFoamCase(Path(__file__).parent).run(parallel=False)"
             )
             run.chmod(run.stat().st_mode | stat.S_IEXEC)
 
@@ -36,7 +36,7 @@ async def cavity(request: pytest.FixtureRequest) -> "AsyncGenerator[AsyncFoamCas
             assert not clean.exists()
             assert not (clone.path / "Allclean").exists()
             clean.write_text(
-                "#!/usr/bin/env python3\nfrom foamlib import FoamCase\nFoamCase().clean()"
+                "#!/usr/bin/env python3\nfrom pathlib import Path\nfrom foamlib import FoamCase\nFoamCase(Path(__file__).parent).clean()"
             )
             clean.chmod(clean.stat().st_mode | stat.S_IEXEC)