Index: uspace/lib/cpp/include/__bits/thread/packaged_task.hpp
===================================================================
--- uspace/lib/cpp/include/__bits/thread/packaged_task.hpp	(revision bf13e7118ea017a44e09d6880e2fc8313600859d)
+++ uspace/lib/cpp/include/__bits/thread/packaged_task.hpp	(revision 74803412eeb31a22e8c2ad9b573b200db735ff33)
@@ -28,5 +28,5 @@
 
 #ifndef LIBCPP_BITS_THREAD_PACKAGED_TASK
-#ifndef LIBCPP_BITS_THREAD_PACKAGED_TASK
+#define LIBCPP_BITS_THREAD_PACKAGED_TASK
 
 namespace std