Index: uspace/lib/cpp/include/impl/mutex.hpp
===================================================================
--- uspace/lib/cpp/include/impl/mutex.hpp	(revision 857d4cc5a9a2387b876a7c8d0cb9a0c9679d003a)
+++ uspace/lib/cpp/include/impl/mutex.hpp	(revision a97b8384c55f18fa1f4cc60cf5a00adf24802806)
@@ -156,5 +156,5 @@
 
             void lock();
-            bool try_lock();
+            bool try_lock() noexcept;
             void unlock();
 
Index: uspace/lib/cpp/src/mutex.cpp
===================================================================
--- uspace/lib/cpp/src/mutex.cpp	(revision 857d4cc5a9a2387b876a7c8d0cb9a0c9679d003a)
+++ uspace/lib/cpp/src/mutex.cpp	(revision a97b8384c55f18fa1f4cc60cf5a00adf24802806)
@@ -145,5 +145,5 @@
     }
 
-    bool recursive_timed_mutex::try_lock()
+    bool recursive_timed_mutex::try_lock() noexcept
     {
         if (owner_ != this_thread::get_id())