diff --git a/projects/fal/src/fal/toolkit/file/_local_uploader.py b/projects/fal/src/fal/toolkit/file/_local_uploader.py
index 47117fca8..cf83bb76a 100644
--- a/projects/fal/src/fal/toolkit/file/_local_uploader.py
+++ b/projects/fal/src/fal/toolkit/file/_local_uploader.py
@@ -17,6 +17,8 @@
 if TYPE_CHECKING:
     import httpx
 
+# Keep in sync with infra/modules/nomad_jobs/jobs.tf and isolate-cloud's
+# projects/isolate_controller/src/isolate_controller/scheduler/nomad/forger.py.
 DEFAULT_SOCKET_PATH = "/run/fal-upload/upload.sock"
 _TIMEOUT = 300
 _CONNECT_TIMEOUT = 5
diff --git a/projects/fal/tests/unit/toolkit/file/test_local_uploader.py b/projects/fal/tests/unit/toolkit/file/test_local_uploader.py
index 98da10ffe..21052fe89 100644
--- a/projects/fal/tests/unit/toolkit/file/test_local_uploader.py
+++ b/projects/fal/tests/unit/toolkit/file/test_local_uploader.py
@@ -28,6 +28,22 @@
 STARTED = {**ACCEPTED, "upload_id": "session-id", "state": "receiving"}
 
 
+@pytest.mark.parametrize("socket_path", [None, "/tmp/custom-uploader.sock"])
+def test_client_socket_path(monkeypatch, socket_path):
+    monkeypatch.delenv("CDN_UPLOADER_SOCKET_PATH", raising=False)
+    if socket_path is not None:
+        monkeypatch.setenv("CDN_UPLOADER_SOCKET_PATH", socket_path)
+    transport = Mock(wraps=httpx.HTTPTransport)
+    monkeypatch.setattr(httpx, "HTTPTransport", transport)
+
+    with _local_uploader._new_client():
+        pass
+
+    assert transport.call_args.kwargs["uds"] == (
+        socket_path if socket_path is not None else "/run/fal-upload/upload.sock"
+    )
+
+
 @pytest.fixture
 def transport(monkeypatch):
     requests = []