diff --git a/tinygrad/runtime/support/hcq.py b/tinygrad/runtime/support/hcq.py
index 11221a41cd..f069f08f32 100644
--- a/tinygrad/runtime/support/hcq.py
+++ b/tinygrad/runtime/support/hcq.py
@@ -360,7 +360,7 @@ class HCQCompiled(Compiled, Generic[SignalType]):
   signal_pool: dict[str, list[HCQBuffer]] = collections.defaultdict(list) # per peer group
 
   def __init__(self, device:str, allocator:HCQAllocatorBase, renderer:Renderer, compiler:Compiler, runtime, signal_t:Type[SignalType],
-               comp_queue_t:Callable[[], HWQueue], copy_queue_t:Callable[[], HWQueue]|None, kernargs_size=(16 << 20), sigalloc_size=0x1000,
+               comp_queue_t:Callable[[], HWQueue], copy_queue_t:Callable[[], HWQueue]|None=None, kernargs_size=(16 << 20), sigalloc_size=0x1000,
                supports_graph=True):
     self.device_id:int = int(device.split(":")[1]) if ":" in device else 0