Index: src/strstream.cpp
===================================================================
--- src/strstream.cpp
+++ src/strstream.cpp
@@ -180,7 +180,7 @@
                 delete [] eback();
         }
         setg(buf, buf + ninp, buf + einp);
-        setp(buf + einp, buf + einp + eout);
+        setp(buf + einp, buf + new_size);
         pbump(static_cast<int>(nout));
         __strmode_ |= __allocated;
     }