Index: boost/graph/read_dimacs.hpp
===================================================================
--- boost/graph/read_dimacs.hpp	(revision 52227)
+++ boost/graph/read_dimacs.hpp	(working copy)
@@ -55,7 +55,7 @@
     no_alines=0;                /* no of arc-lines */
 
   std::string in_line;          /* for reading input line */
-  char pr_type[3];              /* for reading type of the problem */
+  char pr_type[4];              /* for reading type of the problem */
   char nd;                      /* source (s) or sink (t) */
 
   int k,                        /* temporary */