diff --git a/radio/USRP/usrp_lib.cpp b/radio/USRP/usrp_lib.cpp
index f224b75354..7cd0f47ee0 100644
--- a/radio/USRP/usrp_lib.cpp
+++ b/radio/USRP/usrp_lib.cpp
@@ -553,7 +553,7 @@ static int trx_usrp_write(openair0_device_t *device,
       LOG_D(HW, "Signaling TX TS %llu\n", (unsigned long long)timestamp);
       pthread_cond_signal(&write_thread->cond_write);
       pthread_mutex_unlock(&write_thread->mutex_write);
-      return 0;
+      return nsamps;
     }
 }