diff --git a/libcxx/include/strstream b/libcxx/include/strstream
--- a/libcxx/include/strstream
+++ b/libcxx/include/strstream
@@ -257,8 +257,8 @@
 #ifndef _LIBCPP_CXX03_LANG
     _LIBCPP_INLINE_VISIBILITY
     istrstream(istrstream&& __rhs)
-        : istream(_VSTD::move(__rhs)),
-          __sb_(_VSTD::move(__rhs.__sb_))
+        : istream(static_cast<istream&&>(__rhs)),
+         __sb_(_VSTD::move(__rhs.__sb_))
     {
         istream::set_rdbuf(&__sb_);
     }
@@ -306,7 +306,7 @@
 #ifndef _LIBCPP_CXX03_LANG
     _LIBCPP_INLINE_VISIBILITY
     ostrstream(ostrstream&& __rhs)
-        : ostream(_VSTD::move(__rhs)),
+        : ostream((static_cast<basic_ostream&&>(__rhs))),
           __sb_(_VSTD::move(__rhs.__sb_))
     {
         ostream::set_rdbuf(&__sb_);
@@ -366,7 +366,7 @@
 #ifndef _LIBCPP_CXX03_LANG
     _LIBCPP_INLINE_VISIBILITY
     strstream(strstream&& __rhs)
-        : iostream(_VSTD::move(__rhs)),
+        : iostream(static_cast<iostream&&>(__rhs)),
           __sb_(_VSTD::move(__rhs.__sb_))
     {
         iostream::set_rdbuf(&__sb_);