diff --git a/include/mutex b/include/mutex
index 9c263565..e2a0daa3 100644
--- a/include/mutex
+++ b/include/mutex
@@ -178,6 +178,7 @@ template<class Callable, class ...Args>
 #ifndef _LIBCPP_HAS_NO_VARIADICS
 #include <tuple>
 #endif
+#include <sched.h>
 
 #include <__undef_min_max>
 
diff --git a/include/thread b/include/thread
index 808d76b8..8a30102f 100644
--- a/include/thread
+++ b/include/thread
@@ -99,6 +99,7 @@ void sleep_for(const chrono::duration<Rep, Period>& rel_time);
 #include <tuple>
 #endif
 #include <pthread.h>
+#include <sched.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header