diff --git a/libraries/wutstdc++/gthread_cond.cc b/libraries/wutstdc++/gthread_cond.cc
index 5ce1254..ad85293 100644
--- a/libraries/wutstdc++/gthread_cond.cc
+++ b/libraries/wutstdc++/gthread_cond.cc
@@ -1,5 +1,10 @@
 #include "include/bits/gthr-default.h"
 
+#include <coreinit/alarm.h>
+#include <coreinit/systeminfo.h>
+#include <coreinit/time.h>
+#include <chrono>
+
 void
 __gthread_cond_init_function (__gthread_cond_t *__cond)
 {
@@ -27,6 +32,55 @@ __gthread_cond_wait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex)
    return 0;
 }
 
+struct TimedWaitData
+{
+   __gthread_cond_t *cond;
+   bool timed_out;
+};
+
+static void
+__gthread_timedwait_alarm_callback(OSAlarm *alarm, OSContext *context)
+{
+   TimedWaitData *data = (TimedWaitData *)OSGetAlarmUserData(alarm);
+   data->timed_out = true;
+   OSSignalCond(data->cond);
+}
+
+int
+__gthread_cond_timedwait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex,
+                          const __gthread_time_t *__abs_timeout)
+{
+   auto time = std::chrono::system_clock::now();
+   auto timeout = std::chrono::system_clock::time_point(
+      std::chrono::seconds(__abs_timeout->tv_sec) +
+      std::chrono::nanoseconds(__abs_timeout->tv_nsec));
+
+   // Already timed out!
+   if (timeout <= time) {
+      return ETIMEDOUT;
+   }
+
+   auto duration =
+      std::chrono::duration_cast<std::chrono::nanoseconds>(timeout - time);
+
+   // Set an alarm
+   OSAlarm alarm;
+   TimedWaitData data;
+   data.timed_out = false;
+   data.cond = __cond;
+
+   OSCreateAlarm(&alarm);
+   OSSetAlarmUserData(&alarm, &data);
+   OSSetAlarm(&alarm, OSNanoseconds(duration.count()),
+              &__gthread_timedwait_alarm_callback);
+
+   // Wait on the condition
+   OSWaitCond(__cond, __mutex);
+
+   OSCancelAlarm(&alarm);
+   return data.timed_out ? ETIMEDOUT : 0;
+}
+
 int
 __gthread_cond_wait_recursive (__gthread_cond_t *__cond,
                                __gthread_recursive_mutex_t *__mutex)
diff --git a/libraries/wutstdc++/include/bits/gthr-default.h b/libraries/wutstdc++/include/bits/gthr-default.h
index 578d112..684097e 100644
--- a/libraries/wutstdc++/include/bits/gthr-default.h
+++ b/libraries/wutstdc++/include/bits/gthr-default.h
@@ -151,6 +151,10 @@ __gthread_cond_signal (__gthread_cond_t *__cond);
 int
 __gthread_cond_wait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex);
 
+int
+__gthread_cond_timedwait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex,
+                          const __gthread_time_t *__abs_timeout);
+
 int
 __gthread_cond_wait_recursive (__gthread_cond_t *__cond,
                                __gthread_recursive_mutex_t *__mutex);