diff --git a/redGrapes/redGrapes.cpp b/redGrapes/redGrapes.cpp
index 9d1e5025..8211b2c2 100644
--- a/redGrapes/redGrapes.cpp
+++ b/redGrapes/redGrapes.cpp
@@ -51,7 +51,7 @@ namespace redGrapes
                 SPDLOG_TRACE("create child space = {}", (void*) task_space.get());
                 current_task->children = task_space;
 
-                std::unique_lock<std::shared_mutex> wr_lock(current_task->space->active_child_spaces_mutex);
+                std::unique_lock<std::shared_timed_mutex> wr_lock(current_task->space->active_child_spaces_mutex);
                 current_task->space->active_child_spaces.push_back(task_space);
             }
 
diff --git a/redGrapes/scheduler/event.hpp b/redGrapes/scheduler/event.hpp
index e3470373..8ff2c5c3 100644
--- a/redGrapes/scheduler/event.hpp
+++ b/redGrapes/scheduler/event.hpp
@@ -22,10 +22,6 @@
 #    define REDGRAPES_EVENT_FOLLOWER_LIST_CHUNKSIZE 16
 #endif
 
-namespace std
-{
-    using shared_mutex = shared_timed_mutex;
-} // namespace std
 
 namespace redGrapes
 {
diff --git a/redGrapes/sync/spinlock.hpp b/redGrapes/sync/spinlock.hpp
index 7ed5b914..a4c1d1b2 100644
--- a/redGrapes/sync/spinlock.hpp
+++ b/redGrapes/sync/spinlock.hpp
@@ -60,7 +60,7 @@ namespace redGrapes
         alignas(64) std::atomic<unsigned> reader_count;
         alignas(64) std::atomic<bool> write;
     #else
-        std::shared_mutex m;
+        std::shared_timed_mutex m;
     #endif
 
         SpinLock()
diff --git a/redGrapes/task/task_space.hpp b/redGrapes/task/task_space.hpp
index 71e7c987..3efa2fe1 100644
--- a/redGrapes/task/task_space.hpp
+++ b/redGrapes/task/task_space.hpp
@@ -28,7 +28,7 @@ namespace redGrapes
         unsigned depth;
         Task* parent;
 
-        std::shared_mutex active_child_spaces_mutex;
+        std::shared_timed_mutex active_child_spaces_mutex;
         std::vector<std::shared_ptr<TaskSpace>> active_child_spaces;
 
         virtual ~TaskSpace();