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-rw-r--r--host/examples/tx_samples_from_file.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/host/examples/tx_samples_from_file.cpp b/host/examples/tx_samples_from_file.cpp
index 382d42a40..7493718d2 100644
--- a/host/examples/tx_samples_from_file.cpp
+++ b/host/examples/tx_samples_from_file.cpp
@@ -103,7 +103,9 @@ int UHD_SAFE_MAIN(int argc, char* argv[])
uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(args);
// Lock mboard clocks
- usrp->set_clock_source(ref);
+ if (vm.count("ref")) {
+ usrp->set_clock_source(ref);
+ }
// always select the subdevice first, the channel mapping affects the other settings
if (vm.count("subdev"))