diff --git a/artiq/gateware/targets/kasli.py b/artiq/gateware/targets/kasli.py
index 9070bf241..9c37c2220 100755
--- a/artiq/gateware/targets/kasli.py
+++ b/artiq/gateware/targets/kasli.py
@@ -816,7 +816,7 @@ class _SatelliteBase(BaseSoC):
         self.comb += [sfp_ctl.led.eq(channel.rx_ready)
             for sfp_ctl, channel in zip(sfp_ctls, self.drtio_transceiver.channels)]
 
-        self.rtio_tsc = rtio.TSC("sync", glbl_fine_ts_width=3)
+        self.submodules.rtio_tsc = rtio.TSC("sync", glbl_fine_ts_width=3)
 
         drtioaux_csr_group = []
         drtioaux_memory_group = []