diff --git a/libcxx/src/condition_variable.cpp b/libcxx/src/condition_variable.cpp
--- a/libcxx/src/condition_variable.cpp
+++ b/libcxx/src/condition_variable.cpp
@@ -63,15 +63,12 @@
     seconds s = duration_cast<seconds>(d);
     typedef decltype(ts.tv_sec) ts_sec;
     _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
-    if (s.count() < ts_sec_max)
-    {
-        ts.tv_sec = static_cast<ts_sec>(s.count());
-        ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((d - s).count());
-    }
-    else
-    {
-        ts.tv_sec = ts_sec_max;
-        ts.tv_nsec = giga::num - 1;
+    if ((unsigned long long)s.count() < ts_sec_max) {
+      ts.tv_sec  = static_cast<ts_sec>(s.count());
+      ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((d - s).count());
+    } else {
+      ts.tv_sec  = ts_sec_max;
+      ts.tv_nsec = giga::num - 1;
     }
     int ec = __libcpp_condvar_timedwait(&__cv_, lk.mutex()->native_handle(), &ts);
     if (ec != 0 && ec != ETIMEDOUT)