diff --git a/CHANGES b/CHANGES
index bfa947a160..5731cb6d07 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,7 @@
+3245.	[bug]		Don't report a error unchanged serials unless there
+			were other changes when thawing a zone with
+			ixfr-fromdifferences. [RT #26845]
+
 3244.	[func]		Added readline support to nslookup and nsupdate.
 			Also simplified nsupdate syntax to make "update" 
 			and "prereq" optional. [RT #24659]
diff --git a/bin/tests/system/inline/tests.sh b/bin/tests/system/inline/tests.sh
index 3cd25c1ea0..836e9d0a2a 100644
--- a/bin/tests/system/inline/tests.sh
+++ b/bin/tests/system/inline/tests.sh
@@ -14,7 +14,7 @@
 # OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 # PERFORMANCE OF THIS SOFTWARE.
 
-# $Id: tests.sh,v 1.9 2011/12/09 22:09:25 marka Exp $
+# $Id: tests.sh,v 1.10 2011/12/19 23:46:13 marka Exp $
 
 SYSTEMTESTTOP=..
 . $SYSTEMTESTTOP/conf.sh
@@ -548,6 +548,18 @@ done
 if [ $ret != 0 ]; then echo "I:failed"; fi
 status=`expr $status + $ret`
 
+n=`expr $n + 1`
+echo "I:checking rndc freeze/thaw of dynamic inline zone no change ($n)"
+ret=0
+$RNDC -c ../common/rndc.conf -s 10.53.0.3 -p 9953 freeze dynamic > freeze.test$n 2>&1 || { echo "I: rndc freeze dynamic failed" ; sed 's/^/I:/' < freeze.test$n ; ret=1;  }
+sleep 1
+$RNDC -c ../common/rndc.conf -s 10.53.0.3 -p 9953 thaw dynamic > thaw.test$n 2>&1 || { echo "I: rndc thaw dynamic failed" ; ret=1; }
+sleep 1
+grep "zone dynamic/IN (unsigned): ixfr-from-differences: unchanged" ns3/named.run > /dev/null ||  ret=1
+if [ $ret != 0 ]; then echo "I:failed"; fi
+status=`expr $status + $ret`
+
+
 n=`expr $n + 1`
 echo "I:checking rndc freeze/thaw of dynamic inline zone ($n)"
 ret=0
diff --git a/lib/dns/zone.c b/lib/dns/zone.c
index b5601a837b..124aecd837 100644
--- a/lib/dns/zone.c
+++ b/lib/dns/zone.c
@@ -15,7 +15,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: zone.c,v 1.654 2011/12/09 22:09:26 marka Exp $ */
+/* $Id: zone.c,v 1.655 2011/12/19 23:46:12 marka Exp $ */
 
 /*! \file */
 
@@ -3524,6 +3524,20 @@ maybe_send_securedb(dns_zone_t *zone) {
 	UNLOCK_ZONE(zone->raw);
 }
 
+static isc_boolean_t
+zone_unchanged(dns_db_t *db1, dns_db_t *db2, isc_mem_t *mctx) {
+	isc_result_t result;
+	isc_boolean_t answer = ISC_FALSE;
+	dns_diff_t diff;
+
+	dns_diff_init(mctx, &diff);
+	result = dns_db_diffx(&diff, db1, NULL, db2, NULL, NULL);
+	if (result == ISC_R_SUCCESS && ISC_LIST_EMPTY(diff.tuples))
+		answer = ISC_TRUE;
+	dns_diff_clear(&diff);
+	return (answer);
+}
+
 static isc_result_t
 zone_postload(dns_zone_t *zone, dns_db_t *db, isc_time_t loadtime,
 	      isc_result_t result)
@@ -3755,6 +3769,14 @@ zone_postload(dns_zone_t *zone, dns_db_t *db, isc_time_t loadtime,
 
 				INSIST(zone->type == dns_zone_master);
 
+				if (serial == oldserial &&
+				    zone_unchanged(zone->db, db, zone->mctx)) {
+					dns_zone_log(zone, ISC_LOG_INFO,
+						     "ixfr-from-differences: "
+						     "unchanged");
+					return(ISC_R_SUCCESS);
+				}
+
 				serialmin = (oldserial + 1) & 0xffffffffU;
 				serialmax = (oldserial + 0x7fffffffU) &
 					     0xffffffffU;