diff --git a/libcxx/include/ios b/libcxx/include/ios
--- a/libcxx/include/ios
+++ b/libcxx/include/ios
@@ -695,7 +695,7 @@
 }
 
 template <class _CharT, class _Traits>
-basic_ios<_CharT, _Traits>::~basic_ios()
+inline basic_ios<_CharT, _Traits>::~basic_ios()
 {
 }