diff --git a/src/gateware/kasli_soc.py b/src/gateware/kasli_soc.py
index c7c9e1e..e774e63 100755
--- a/src/gateware/kasli_soc.py
+++ b/src/gateware/kasli_soc.py
@@ -15,7 +15,6 @@ from misoc.integration import cpu_interface
 from artiq.coredevice import jsondesc
 from artiq.gateware import rtio, eem_7series
 from artiq.gateware.rtio.phy import ttl_simple
-from artiq.gateware.rtio.xilinx_clocking import RTIOClockMultiplier
 from artiq.gateware.drtio.transceiver import gtx_7series
 from artiq.gateware.drtio.siphaser import SiPhaser7Series
 from artiq.gateware.drtio.rx_synchronizer import XilinxRXSynchronizer
diff --git a/src/gateware/zc706.py b/src/gateware/zc706.py
index 45dcbad..9556e27 100755
--- a/src/gateware/zc706.py
+++ b/src/gateware/zc706.py
@@ -15,7 +15,7 @@ from misoc.cores import gpio
 
 from artiq.gateware import rtio, nist_clock, nist_qc2
 from artiq.gateware.rtio.phy import ttl_simple, ttl_serdes_7series, dds, spi2
-from artiq.gateware.rtio.xilinx_clocking import RTIOClockMultiplier, fix_serdes_timing_path
+from artiq.gateware.rtio.xilinx_clocking import fix_serdes_timing_path
 from artiq.gateware.drtio.transceiver import gtx_7series
 from artiq.gateware.drtio.siphaser import SiPhaser7Series
 from artiq.gateware.drtio.rx_synchronizer import XilinxRXSynchronizer