diff --git a/src/algorithms/signal_source/gnuradio_blocks/rtl_tcp_signal_source_c.cc b/src/algorithms/signal_source/gnuradio_blocks/rtl_tcp_signal_source_c.cc
index c956f4f4c..71c09a8c8 100644
--- a/src/algorithms/signal_source/gnuradio_blocks/rtl_tcp_signal_source_c.cc
+++ b/src/algorithms/signal_source/gnuradio_blocks/rtl_tcp_signal_source_c.cc
@@ -154,7 +154,7 @@ rtl_tcp_signal_source_c::rtl_tcp_signal_source_c(const std::string &address,
 
 rtl_tcp_signal_source_c::~rtl_tcp_signal_source_c()
 {
-    boost::mutex::scoped_lock lock(mutex_);
+    mutex_.unlock();
     io_service_.stop();
     not_empty_.notify_one();
     not_full_.notify_one();