diff --git a/include/__threading_support b/include/__threading_support
index baa1222..097cb73 100644
--- a/include/__threading_support
+++ b/include/__threading_support
@@ -22,6 +22,8 @@
 # include <__external_threading>
 #elif !defined(_LIBCPP_HAS_NO_THREADS)
 
+typedef ::timespec __libcpp_timespec_t;
+
 #if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
 # include <pthread.h>
 # include <sched.h>
@@ -148,7 +150,7 @@
 
 _LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
 int __libcpp_condvar_timedwait(__libcpp_condvar_t *__cv, __libcpp_mutex_t *__m,
-                               timespec *__ts);
+                               __libcpp_timespec_t *__ts);
 
 _LIBCPP_THREAD_ABI_VISIBILITY
 int __libcpp_condvar_destroy(__libcpp_condvar_t* __cv);
@@ -287,7 +289,7 @@
 }
 
 int __libcpp_condvar_timedwait(__libcpp_condvar_t *__cv, __libcpp_mutex_t *__m,
-                               timespec *__ts)
+                               __libcpp_timespec_t *__ts)
 {
   return pthread_cond_timedwait(__cv, __m, __ts);
 }
@@ -356,7 +358,7 @@
 {
    using namespace chrono;
    seconds __s = duration_cast<seconds>(__ns);
-   timespec __ts;
+   __libcpp_timespec_t __ts;
    typedef decltype(__ts.tv_sec) ts_sec;
    _LIBCPP_CONSTEXPR ts_sec __ts_sec_max = numeric_limits<ts_sec>::max();
 
diff --git a/src/condition_variable.cpp b/src/condition_variable.cpp
index 8d769f4..e9b3739 100644
--- a/src/condition_variable.cpp
+++ b/src/condition_variable.cpp
@@ -60,7 +60,7 @@
     nanoseconds d = tp.time_since_epoch();
     if (d > nanoseconds(0x59682F000000E941))
         d = nanoseconds(0x59682F000000E941);
-    timespec ts;
+    __libcpp_timespec_t ts;
     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();
diff --git a/src/support/win32/thread_win32.cpp b/src/support/win32/thread_win32.cpp
index 3ca36df..83e7e9f 100644
--- a/src/support/win32/thread_win32.cpp
+++ b/src/support/win32/thread_win32.cpp
@@ -110,7 +110,7 @@
 }
 
 int __libcpp_condvar_timedwait(__libcpp_condvar_t *__cv, __libcpp_mutex_t *__m,
-                               timespec *__ts)
+                               __libcpp_timespec_t *__ts)
 {
   using namespace _VSTD::chrono;