diff --git a/artiq/coredevice/ad9914.py b/artiq/coredevice/ad9914.py
index bd2ec4db0..aceb79f17 100644
--- a/artiq/coredevice/ad9914.py
+++ b/artiq/coredevice/ad9914.py
@@ -84,7 +84,7 @@ class AD9914:
 
     @kernel
     def write(self, addr, data):
-        rtio_output(now_mu(), self.bus_channel, addr, data)
+        rtio_output((self.bus_channel << 8) | addr, data)
         delay_mu(self.write_duration_mu)
 
     @kernel