--- a/mplex/main.cpp
+++ b/mplex/main.cpp
@@ -50,7 +50,7 @@
 #include "multiplexor.hpp"
 
 
-using std::auto_ptr;
+using std::unique_ptr;
 
 
 /*************************************************************************
@@ -138,7 +138,7 @@
 void 
 FileOutputStream::NextSegment( )
 {
-    auto_ptr<char> prev_filename_buf( new char[strlen(cur_filename)+1] );
+    unique_ptr<char[]> prev_filename_buf( new char[strlen(cur_filename)+1] );
     char *prev_filename = prev_filename_buf.get();
 	fclose(strm);
 	++segment_num;