diff --git a/protocol/esta/dmx/universe.cpp b/protocol/esta/dmx/universe.cpp
index 5963d6a..683caa2 100644
--- a/protocol/esta/dmx/universe.cpp
+++ b/protocol/esta/dmx/universe.cpp
@@ -295,7 +295,6 @@ void Universe::rx_timeout_(bool add_now)
  */
 void Universe::do_callbacks_(std::vector<std::weak_ptr<const std::function<void(Universe*)>>> & callbacks)
 {
-  std::shared_lock lk_ctl(mtx_control);
   for (auto it = callbacks.cbegin(); it != callbacks.cend();)
     {
       if (auto sp = it->lock())
@@ -305,11 +304,8 @@ void Universe::do_callbacks_(std::vector<std::weak_ptr<const std::function<void(
         }
       else
         { // the owner has released the token
-          lk_ctl.unlock();                  // release the shared lock
-          mtx_control.lock();               // take a unique lock
+          std::unique_lock lk(mtx_control);
           it = callbacks.erase(it);
-          mtx_control.unlock();             // release the unique lock
-          lk_ctl.lock();                    // retake the shared lock
         }
     }
 }
diff --git a/protocol/esta/sacn/arbitratinguniverse.cpp b/protocol/esta/sacn/arbitratinguniverse.cpp
index 8bd829c..be3bee2 100644
--- a/protocol/esta/sacn/arbitratinguniverse.cpp
+++ b/protocol/esta/sacn/arbitratinguniverse.cpp
@@ -192,7 +192,6 @@ std::shared_ptr<void> ArbitratingUniverse::onSourceListChange(std::function<void
  */
 void ArbitratingUniverse::doListChangeCallbacks()
 {
-  std::shared_lock lk_ctl(mtx_control);
   for (auto it = cb_sourceListChange.cbegin(); it != cb_sourceListChange.cend();)
   {
     if (auto sp = it->lock())
@@ -202,12 +201,8 @@ void ArbitratingUniverse::doListChangeCallbacks()
     }
     else
     { // or remove the callback
-
-      lk_ctl.unlock();                  // release the shared lock
-      mtx_control.lock();               // take a unique lock
+      std::unique_lock lk_ctl(mtx_control);
       it = cb_sourceListChange.erase(it);
-      mtx_control.unlock();             // release the unique lock
-      lk_ctl.lock();                    // retake the shared lock
     }
   }
 }