diff --git a/src/libboard_artiq/src/cxp_upconn.rs b/src/libboard_artiq/src/cxp_upconn.rs
index 02467ac..396b1b6 100644
--- a/src/libboard_artiq/src/cxp_upconn.rs
+++ b/src/libboard_artiq/src/cxp_upconn.rs
@@ -24,7 +24,7 @@ pub fn tx_test(channel: usize, timer: &mut GlobalTimer) {
         // CXP[channel].upconn_ack_write(1);
 
         timer.delay_us(20);
-        (CXP[channel].upconn_tx_enable_write)(0);
+        csr::cxp_phys::upconn_tx_enable_write(0);
 
         // Collect data
         let mut i: usize = 0;