diff --git a/CHANGES b/CHANGES
index 9613358bd2..a8143fb58d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+2026.	[port]		linux: socket.c compatability for old systems.
+			[RT #16015]
+
 2027.	[port]		libbind: Solaris x68 support. [RT #16020]
 
 2026.	[bug]		Rate limit the two recursive client exceeded messages.
diff --git a/lib/isc/unix/socket.c b/lib/isc/unix/socket.c
index 65bc00f0f4..e53d692fff 100644
--- a/lib/isc/unix/socket.c
+++ b/lib/isc/unix/socket.c
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: socket.c,v 1.263 2006/02/03 23:51:39 marka Exp $ */
+/* $Id: socket.c,v 1.264 2006/05/19 02:47:18 marka Exp $ */
 
 /*! \file */
 
@@ -115,7 +115,7 @@ typedef isc_event_t intev_t;
  * to collect the destination address and interface so the client can
  * set them on outgoing packets.
  */
-#ifdef ISC_PLATFORM_HAVEIPV6
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
 #ifndef USE_CMSG
 #define USE_CMSG	1
 #endif