1 files changed, 3 insertions, 0 deletions
diff --git a/gnuradio-runtime/include/gnuradio/rpcserver_thrift.h b/gnuradio-runtime/include/gnuradio/rpcserver_thrift.h
index 027a9ea75e..203be66e9a 100644
--- a/gnuradio-runtime/include/gnuradio/rpcserver_thrift.h
+++ b/gnuradio-runtime/include/gnuradio/rpcserver_thrift.h
@@ -32,6 +32,7 @@
 #include "thrift/ControlPort.h"
 #include "thrift/gnuradio_types.h"
 #include <boost/format.hpp>
+#include <boost/thread/mutex.hpp>
 
 #define S(x) #x
 #define S_(x) S(x)
@@ -61,6 +62,8 @@ public:
   virtual void shutdown();
 
  private:
+  boost::mutex d_callback_map_lock;
+
   typedef std::map<std::string, configureCallback_t> ConfigureCallbackMap_t;
   ConfigureCallbackMap_t d_setcallbackmap;