diff --git a/fasthtml/core.py b/fasthtml/core.py
index ebf03fd2..c1b7a798 100644
--- a/fasthtml/core.py
+++ b/fasthtml/core.py
@@ -276,8 +276,8 @@ def __init__(self, f, skip=None): self.f,self.skip = f,skip or []
     def __repr__(self): return f'Beforeware({self.f}, skip={self.skip})'
 
 # %% ../nbs/api/00_core.ipynb #78c3c357
-async def _handle(f, *args, **kwargs):
-    return (await f(*args, **kwargs)) if is_async_callable(f) else await run_in_threadpool(f, *args, **kwargs)
+async def _handle(_f, *args, **kwargs):
+    return (await _f(*args, **kwargs)) if is_async_callable(_f) else await run_in_threadpool(_f, *args, **kwargs)
 
 # %% ../nbs/api/00_core.ipynb #ad0f0e87
 async def _wrap_ws(ws, data, params):
diff --git a/nbs/api/00_core.ipynb b/nbs/api/00_core.ipynb
index 33df5c20..c451aa7b 100644
--- a/nbs/api/00_core.ipynb
+++ b/nbs/api/00_core.ipynb
@@ -1132,8 +1132,8 @@
    "outputs": [],
    "source": [
     "#| export\n",
-    "async def _handle(f, *args, **kwargs):\n",
-    "    return (await f(*args, **kwargs)) if is_async_callable(f) else await run_in_threadpool(f, *args, **kwargs)"
+    "async def _handle(_f, *args, **kwargs):\n",
+    "    return (await _f(*args, **kwargs)) if is_async_callable(_f) else await run_in_threadpool(_f, *args, **kwargs)"
    ]
   },
   {
@@ -4865,4 +4865,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 5
-}
+}
\ No newline at end of file
diff --git a/tests/test_core.py b/tests/test_core.py
new file mode 100644
index 00000000..14a16eb7
--- /dev/null
+++ b/tests/test_core.py
@@ -0,0 +1,16 @@
+from fasthtml.common import *
+from starlette.testclient import TestClient
+
+app, rt = fast_app()
+cli = TestClient(app)
+
+@rt("/test-f")
+def post(f: str):
+    return Titled("Success", P(f"Value: {f}"))
+
+def test_argument_f_collision():
+    res = cli.post('/test-f', data={'f': 'hello'})
+    assert res.status_code == 200
+    assert 'Value: hello' in res.text
+
+test_argument_f_collision()