diff --git a/CHANGES b/CHANGES
index 8fc8d55120..15164c39ae 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+  53.	[port]		freebsd 4.0: lib/isc/unix/socket.c requires
+			<sys/param.h>.
+
   52.	[bug]		rndc: taskmgr and socketmgr were not initaliased
 			to NULL.
 
diff --git a/lib/isc/unix/socket.c b/lib/isc/unix/socket.c
index 43fb6a04ac..e9e19e1839 100644
--- a/lib/isc/unix/socket.c
+++ b/lib/isc/unix/socket.c
@@ -17,6 +17,7 @@
 
 #include <config.h>
 
+#include <sys/param.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/time.h>