1 files changed, 4 insertions, 0 deletions
diff --git a/host/lib/include/uhdlib/usrp/common/mpmd_mb_controller.hpp b/host/lib/include/uhdlib/usrp/common/mpmd_mb_controller.hpp
index a40398991..e7498b9f5 100644
--- a/host/lib/include/uhdlib/usrp/common/mpmd_mb_controller.hpp
+++ b/host/lib/include/uhdlib/usrp/common/mpmd_mb_controller.hpp
@@ -101,6 +101,8 @@ public:
     std::vector<std::string> get_gpio_src(const std::string& bank) override;
     void set_gpio_src(
         const std::string& bank, const std::vector<std::string>& src) override;
+    void register_sync_source_updater(
+        mb_controller::sync_source_updater_t callback_f) override;
 
 private:
     /**************************************************************************
@@ -118,6 +120,8 @@ private:
     std::vector<std::string> _gpio_banks;
     std::unordered_map<std::string, std::vector<std::string>> _gpio_srcs;
 
+    std::vector<mb_controller::sync_source_updater_t> _sync_source_updaters;
+
 public:
     /*! When the FPGA is reloaded, pass the notification to every Radio block
      *  Public to allow other classes to register for notifications.