Index: indirect_streambuf.hpp
===================================================================
--- indirect_streambuf.hpp	(revision 26)
+++ indirect_streambuf.hpp	(working copy)
@@ -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());
         }
     }