--- a/src/node/ipv4-address.h	Mon Feb 12 22:44:41 2007 +0100
+++ b/src/node/ipv4-address.h	Mon Feb 12 23:22:48 2007 +0100
@@ -52,7 +52,7 @@
   void SetHostOrder (uint32_t ip);
   void Serialize (uint8_t buf[4]) const;
 
-  void Print (std::ostream *os) const;
+  void Print (std::ostream &os) const;
 
   bool IsBroadcast (void);
   bool IsMulticast (void);
@@ -83,7 +83,7 @@
   uint32_t GetHostOrder (void) const;
   void SetHostOrder (uint32_t value);
 
-  void Print (std::ostream *os) const;
+  void Print (std::ostream &os) const;
 
   static Ipv4Mask GetLoopback (void);
   static Ipv4Mask GetZero (void);