Index: uspace/lib/cpp/include/impl/string.hpp
===================================================================
--- uspace/lib/cpp/include/impl/string.hpp	(revision 1610aa356dcd6d6030b77210c6c9238bfea98375)
+++ uspace/lib/cpp/include/impl/string.hpp	(revision 17c41c37362dddb20eba6f84eece106fe2a0c71b)
@@ -38,4 +38,5 @@
 #include <cwchar>
 #include <memory>
+#include <internal/stringfwd.hpp>
 #include <utility>
 
@@ -422,6 +423,5 @@
      */
 
-    template<class Char, class Traits = char_traits<Char>,
-             class Allocator = allocator<Char>>
+    template<class Char, class Traits, class Allocator>
     class basic_string
     {
Index: uspace/lib/cpp/include/internal/stringfwd.hpp
===================================================================
--- uspace/lib/cpp/include/internal/stringfwd.hpp	(revision 17c41c37362dddb20eba6f84eece106fe2a0c71b)
+++ uspace/lib/cpp/include/internal/stringfwd.hpp	(revision 17c41c37362dddb20eba6f84eece106fe2a0c71b)
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2018 Jaroslav Jindrak
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef LIBCPP_INTERNAL_STRINGFWD
+#define LIBCPP_INTERNAL_STRINGFWD
+
+namespace std
+{
+    template<class Char>
+    struct char_traits;
+
+    template<class T>
+    struct allocator;
+
+    template<
+        class Char,
+        class Traits = char_traits<Char>,
+        class Allocator = allocator<Char>
+    >
+    class basic_string;
+
+    using string  = basic_string<char>;
+    using wstring = basic_string<wchar_t>;
+
+}
+
+#endif