diff --git a/libstdc++/include/cstddef b/libstdc++/include/cstddef
index fc1ca9d..cb06b49 100644
--- a/libstdc++/include/cstddef
+++ b/libstdc++/include/cstddef
@@ -38,9 +38,13 @@
  */
 #include <stddef.h>
 
+extern "C++" {
+
 namespace std {
 using ::ptrdiff_t;
 using ::size_t;
 }  // namespace std
 
+}  // extern C++
+
 #endif  // BIONIC_LIBSTDCPP_INCLUDE_CSTDDEF__