Index: uspace/lib/cpp/include/__bits/chrono.hpp
===================================================================
--- uspace/lib/cpp/include/__bits/chrono.hpp	(revision b96e87e5595e9eb83bdc3903031f9251b0acf941)
+++ uspace/lib/cpp/include/__bits/chrono.hpp	(revision 96fec1678583fe1a2525ee66f3db73a750a0b95a)
@@ -331,5 +331,5 @@
     {
         using CD = common_type_t<duration<Rep1, Period1>, duration<Rep2, Period2>>;
-        return CD(CD(lhs.count()) + CD(rhs.count()));
+        return CD(CD(lhs).count() + CD(rhs).count());
     }