diff --git a/openpilot/selfdrive/modeld/helpers.py b/openpilot/selfdrive/modeld/helpers.py
index d65329a24f..4d1091221e 100644
--- a/openpilot/selfdrive/modeld/helpers.py
+++ b/openpilot/selfdrive/modeld/helpers.py
@@ -23,8 +23,7 @@ def load_oob(f, chestnut=False):
     opcodes = f.read(struct.unpack('<q', f.read(8))[0])
     buffers = Tensor(np.frombuffer(f.read(), np.uint8)).realize().uop.buffer
     unpickler = pickle.Unpickler(io.BytesIO(opcodes))
-    unpickler.persistent_load = lambda pid: buffers.view(*pid)
-    return unpickler.load()
+    return type("_Unpickler", (pickle.Unpickler,), {"persistent_load": lambda self, pid: buffers.view(*pid)})(io.BytesIO(opcodes)).load()
 
 def chestnut_present() -> bool:
   for d in USB_DEVICES_PATH.glob("*"):