--- boost-1_49/boost/iostreams/detail/streambuf/indirect_streambuf.hpp	2012-10-17 12:44:42.299596554 +0300
+++ boost-1_49/boost/iostreams/detail/streambuf/indirect_streambuf.hpp	2012-10-17 12:44:42.299596554 +0300
@@ -395,7 +395,7 @@
             setp(out().begin(), out().end());
         else {
             const char_type* ptr = pptr();
-            setp(out().begin() + amt, out().end());
+            setp(pbase() + amt, out().end());
             pbump(ptr - pptr());
         }
     }