diff --git a/providers/bind/serial.go b/providers/bind/serial.go
index 3d8c0ed3f..b1d5c6812 100644
--- a/providers/bind/serial.go
+++ b/providers/bind/serial.go
@@ -3,7 +3,6 @@ package bind
 import (
 	"log"
 	"strconv"
-	"strings"
 	"time"
 )
 
@@ -20,36 +19,20 @@ func generateSerial(oldSerial uint32) uint32 {
 	// At no time will a serial number == 0 be returned.
 
 	original := oldSerial
-	oldSerialStr := strconv.FormatUint(uint64(oldSerial), 10)
 	var newSerial uint32
 
 	// Make draft new serial number:
 	today := nowFunc().UTC()
 	todayStr := today.Format("20060102")
-	version := uint32(1)
 	todayNum, err := strconv.ParseUint(todayStr, 10, 32)
 	if err != nil {
 		log.Fatalf("new serial won't fit in 32 bits: %v", err)
 	}
-	draft := uint32(todayNum)*100 + version
+	draft := uint32(todayNum * 100)
 
 	method := "none" // Used only in debugging.
-	if oldSerial > draft {
-		// If old_serial was really slow, upgrade to new yyyymmddvv standard:
-		method = "o>d"
-		newSerial = oldSerial + 1
-		newSerial = oldSerial + 1
-	} else if oldSerial == draft {
-		// Edge case: increment old serial:
-		method = "o=d"
-		newSerial = draft + 1
-	} else if len(oldSerialStr) != 10 {
-		// If old_serial is wrong number of digits, upgrade to yyyymmddvv standard:
-		method = "len!=10"
-		newSerial = draft
-	} else if strings.HasPrefix(oldSerialStr, todayStr) {
-		// If old_serial just needs to be incremented:
-		method = "prefix"
+	if oldSerial >= draft {
+		method = "o>=d"
 		newSerial = oldSerial + 1
 	} else {
 		// First serial number to be requested today:
diff --git a/providers/bind/serial_test.go b/providers/bind/serial_test.go
index 46f2eccca..2a47e307c 100644
--- a/providers/bind/serial_test.go
+++ b/providers/bind/serial_test.go
@@ -14,28 +14,31 @@ func Test_generate_serial_1(t *testing.T) {
 		Today    time.Time
 		Expected uint32
 	}{
-		{0, d1, 2015010801},
-		{123, d1, 2015010801},
+		{0, d1, 2015010800},
+		{1, d1, 2015010800},
+		{123, d1, 2015010800},
 		{2015010800, d1, 2015010801},
 		{2015010801, d1, 2015010802},
 		{2015010802, d1, 2015010803},
 		{2015010898, d1, 2015010899},
 		{2015010899, d1, 2015010900},
 		{2015090401, d1, 2015090402},
-		{201509040, d1, 2015010801},
-		{20150904, d1, 2015010801},
-		{2015090, d1, 2015010801},
+		{201509040, d1, 2015010800},
+		{20150904, d1, 2015010800},
+		{2015090, d1, 2015010800},
+		// If the number is very large, just increment:
+		{2099000000, d1, 2099000001},
 		// Verify 32-bits is enough to carry us 200 years in the future:
 		{4015090401, d4, 4015090402},
 		// Verify Dec 31 edge-case:
-		{2015123099, d12, 2015123101},
+		{2015123099, d12, 2015123100},
 		{2015123100, d12, 2015123101},
 		{2015123101, d12, 2015123102},
 		{2015123102, d12, 2015123103},
 		{2015123198, d12, 2015123199},
 		{2015123199, d12, 2015123200},
 		{2015123200, d12, 2015123201},
-		{201512310, d12, 2015123101},
+		{201512310, d12, 2015123100},
 	}
 
 	for i, tst := range tests {
diff --git a/providers/bind/soa_test.go b/providers/bind/soa_test.go
index d22da1d5f..4bf8a4afa 100644
--- a/providers/bind/soa_test.go
+++ b/providers/bind/soa_test.go
@@ -23,7 +23,7 @@ func Test_makeSoa(t *testing.T) {
 			&models.RecordConfig{Target: "", SoaMbox: "", SoaSerial: 0, SoaRefresh: 0, SoaRetry: 0, SoaExpire: 0, SoaMinttl: 0},
 			&models.RecordConfig{Target: "", SoaMbox: "", SoaSerial: 0, SoaRefresh: 0, SoaRetry: 0, SoaExpire: 0, SoaMinttl: 0},
 			&models.RecordConfig{Target: "DEFAULT_NOT_SET.", SoaMbox: "DEFAULT_NOT_SET.", SoaSerial: 1, SoaRefresh: 3600, SoaRetry: 600, SoaExpire: 604800, SoaMinttl: 1440},
-			2019022301,
+			2019022300,
 		},
 		{
 			// If everything is filled, leave the desired values in place.
@@ -31,7 +31,7 @@ func Test_makeSoa(t *testing.T) {
 			&models.RecordConfig{Target: "a", SoaMbox: "aa", SoaSerial: 10, SoaRefresh: 11, SoaRetry: 12, SoaExpire: 13, SoaMinttl: 14},
 			&models.RecordConfig{Target: "b", SoaMbox: "bb", SoaSerial: 15, SoaRefresh: 16, SoaRetry: 17, SoaExpire: 18, SoaMinttl: 19},
 			&models.RecordConfig{Target: "b", SoaMbox: "bb", SoaSerial: 15, SoaRefresh: 16, SoaRetry: 17, SoaExpire: 18, SoaMinttl: 19},
-			2019022301,
+			2019022300,
 		},
 		{
 			// Test incrementing serial.
@@ -55,7 +55,7 @@ func Test_makeSoa(t *testing.T) {
 			&models.RecordConfig{Target: "", SoaMbox: "aa", SoaSerial: 0, SoaRefresh: 11, SoaRetry: 0, SoaExpire: 13, SoaMinttl: 0},
 			&models.RecordConfig{Target: "b", SoaMbox: "", SoaSerial: 15, SoaRefresh: 0, SoaRetry: 17, SoaExpire: 0, SoaMinttl: 19},
 			&models.RecordConfig{Target: "b", SoaMbox: "aa", SoaSerial: 15, SoaRefresh: 11, SoaRetry: 17, SoaExpire: 13, SoaMinttl: 19},
-			2019022301,
+			2019022300,
 		},
 		{
 			// Gaps + existing==nil
@@ -63,7 +63,7 @@ func Test_makeSoa(t *testing.T) {
 			nil,
 			&models.RecordConfig{Target: "b", SoaMbox: "", SoaSerial: 15, SoaRefresh: 0, SoaRetry: 17, SoaExpire: 0, SoaMinttl: 19},
 			&models.RecordConfig{Target: "b", SoaMbox: "root.example.com", SoaSerial: 15, SoaRefresh: 2, SoaRetry: 17, SoaExpire: 4, SoaMinttl: 19},
-			2019022301,
+			2019022300,
 		},
 		{
 			// Gaps + desired==nil
@@ -72,7 +72,7 @@ func Test_makeSoa(t *testing.T) {
 			&models.RecordConfig{Target: "", SoaMbox: "aa", SoaSerial: 0, SoaRefresh: 11, SoaRetry: 0, SoaExpire: 13, SoaMinttl: 0},
 			nil,
 			&models.RecordConfig{Target: "ns.example.com", SoaMbox: "aa", SoaSerial: 1, SoaRefresh: 11, SoaRetry: 3, SoaExpire: 13, SoaMinttl: 5},
-			2019022301,
+			2019022300,
 		},
 	}