diff --git a/artiq/coredevice/ad53xx.py b/artiq/coredevice/ad53xx.py
index 4d7656072..0266ab836 100644
--- a/artiq/coredevice/ad53xx.py
+++ b/artiq/coredevice/ad53xx.py
@@ -317,7 +317,7 @@ class AD53xx:
         self.ldac.on()
 
     @kernel
-    def set_dac_mu(self, values: list[int32], channels: list[int32] = list(range(40))):
+    def set_dac_mu(self, values: list[int32], channels: list[int32]):  # NAC3TODO default list(range(40))
         """Program multiple DAC channels and pulse LDAC to update the DAC
         outputs.
 
@@ -348,7 +348,7 @@ class AD53xx:
         at_mu(t0)
 
     @kernel
-    def set_dac(self, voltages: list[float], channels: list[int32] = list(range(40))):
+    def set_dac(self, voltages: list[float], channels: list[int32]):  # NAC3TODO default list(range(40))
         """Program multiple DAC channels and pulse LDAC to update the DAC
         outputs.