diff --git a/artiq/gateware/targets/sayma_rtm.py b/artiq/gateware/targets/sayma_rtm.py
index 1872529fa..7f4cc476d 100755
--- a/artiq/gateware/targets/sayma_rtm.py
+++ b/artiq/gateware/targets/sayma_rtm.py
@@ -129,10 +129,6 @@ class SaymaRTM(Module):
             reset_out=0b0111)
         csr_devices.append("clock_mux")
 
-        # UART loopback
-        serial = platform.request("serial")
-        self.comb += serial.tx.eq(serial.rx)
-
         # Allaki: enable RF output, GPIO access to attenuator
         self.comb += [
             platform.request("allaki0_rfsw0").eq(1),