Index: uspace/lib/cpp/include/impl/ios.hpp
===================================================================
--- uspace/lib/cpp/include/impl/ios.hpp	(revision 54939b27839da2d63a4ed8c17fdb67584070e701)
+++ uspace/lib/cpp/include/impl/ios.hpp	(revision ceb251295ef48406a031f96d827451718f9a8488)
@@ -31,4 +31,5 @@
 
 #include <cstdlib>
+#include <iosfwd>
 #include <locale>
 #include <system_error>