diff --git a/artiq/gateware/targets/kasli.py b/artiq/gateware/targets/kasli.py
index b0fe23778..9a3b31a74 100755
--- a/artiq/gateware/targets/kasli.py
+++ b/artiq/gateware/targets/kasli.py
@@ -267,10 +267,8 @@ class Opticlock(_StandaloneBase):
             pads = platform.request("eem{}".format(eem), port)
             if i < 4:
                 cls = ttl_serdes_7series.InOut_8X
-            elif i < 8:
-                cls = ttl_serdes_7series.Output_8X
             else:
-                cls = ttl_simple.Output
+                cls = ttl_serdes_7series.Output_8X
             phy = cls(pads.p, pads.n)
             self.submodules += phy
             rtio_channels.append(rtio.Channel.from_phy(phy))