diff --git a/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp b/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
index 584e9914ad9f61ecb1602697f8f647dbf0493fa3..3a297bc3dff6af50b6acc59bea1599ed7709e5b0 100644
--- a/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
+++ b/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
@@ -619,7 +619,7 @@ extern "C" {
     case 15360000:
       s->usrp->set_master_clock_rate(30.72e06);
       openair0_cfg[0].samples_per_packet    = 2048;
-      openair0_cfg[0].tx_sample_advance     = 153; 
+      openair0_cfg[0].tx_sample_advance     = 103; 
       openair0_cfg[0].tx_bw                 = 20e6;
       openair0_cfg[0].rx_bw                 = 20e6;
       openair0_cfg[0].tx_scheduling_advance = 10240;
@@ -627,7 +627,7 @@ extern "C" {
     case 7680000:
       s->usrp->set_master_clock_rate(30.72e6);
       openair0_cfg[0].samples_per_packet    = 1024;
-      openair0_cfg[0].tx_sample_advance     = 153;
+      openair0_cfg[0].tx_sample_advance     = 90;
       openair0_cfg[0].tx_bw                 = 20e6;
       openair0_cfg[0].rx_bw                 = 20e6;
       openair0_cfg[0].tx_scheduling_advance = 5*openair0_cfg[0].samples_per_packet;