diff --git a/CHANGES b/CHANGES
index a57776077f..4e729e2f38 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+2511.	[cleanup]	dns_rdata_tofmttext() add const to linebreak.
+			[RT #18885]
+
 2510.	[bug]		"dig +sigchase" could trigger REQUIRE failures.
 			[RT #19033]
 
diff --git a/lib/dns/include/dns/rdata.h b/lib/dns/include/dns/rdata.h
index 6ea185001c..a3bb69eebf 100644
--- a/lib/dns/include/dns/rdata.h
+++ b/lib/dns/include/dns/rdata.h
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: rdata.h,v 1.70 2008/04/02 02:37:42 marka Exp $ */
+/* $Id: rdata.h,v 1.71 2008/12/12 04:37:24 marka Exp $ */
 
 #ifndef DNS_RDATA_H
 #define DNS_RDATA_H 1
@@ -385,7 +385,8 @@ dns_rdata_totext(dns_rdata_t *rdata, dns_name_t *origin, isc_buffer_t *target);
 
 isc_result_t
 dns_rdata_tofmttext(dns_rdata_t *rdata, dns_name_t *origin, unsigned int flags,
-		    unsigned int width, char *linebreak, isc_buffer_t *target);
+		    unsigned int width, const char *linebreak,
+		    isc_buffer_t *target);
 /*%<
  * Like dns_rdata_totext, but do formatted output suitable for
  * database dumps.  This is intended for use by dns_db_dump();
diff --git a/lib/dns/rdata.c b/lib/dns/rdata.c
index d35900b4f9..032c3d8ccd 100644
--- a/lib/dns/rdata.c
+++ b/lib/dns/rdata.c
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: rdata.c,v 1.199 2008/09/24 02:46:22 marka Exp $ */
+/* $Id: rdata.c,v 1.200 2008/12/12 04:37:23 marka Exp $ */
 
 /*! \file */
 
@@ -735,7 +735,7 @@ dns_rdata_totext(dns_rdata_t *rdata, dns_name_t *origin, isc_buffer_t *target)
 isc_result_t
 dns_rdata_tofmttext(dns_rdata_t *rdata, dns_name_t *origin,
 		    unsigned int flags, unsigned int width,
-		    char *linebreak, isc_buffer_t *target)
+		    const char *linebreak, isc_buffer_t *target)
 {
 	dns_rdata_textctx_t tctx;