diff --git a/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp b/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
index 4b2a1dbb54bd5b1375432dea91c5b99250d88ffd..959945fd233bdebb7407f5ef4a3d30d97966a6e3 100644
--- a/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
+++ b/targets/ARCH/USRP/USERSPACE/LIB/usrp_lib.cpp
@@ -625,6 +625,7 @@ extern "C" {
       openair0_cfg[0].tx_scheduling_advance = 10240;
       break;
     case 7680000:
+      s->usrp->set_master_clock_rate(30.72e6);
       openair0_cfg[0].samples_per_packet    = 1024;
       openair0_cfg[0].tx_sample_advance     = 80;
       openair0_cfg[0].tx_bw                 = 20e6;