diff --git a/cmd/bucket-replication-utils_gen.go b/cmd/bucket-replication-utils_gen.go
index 933869213..fe129507d 100644
--- a/cmd/bucket-replication-utils_gen.go
+++ b/cmd/bucket-replication-utils_gen.go
@@ -903,7 +903,7 @@ func (z *ReplicationState) DecodeMsg(dc *msgp.Reader) (err error) {
 					return
 				}
 				var za0004 VersionPurgeStatusType
-				err = za0004.DecodeMsg(dc)
+				err = (*replication.VersionPurgeStatusType)(&za0004).DecodeMsg(dc)
 				if err != nil {
 					err = msgp.WrapError(err, "PurgeTargets", za0003)
 					return
@@ -1060,7 +1060,7 @@ func (z *ReplicationState) EncodeMsg(en *msgp.Writer) (err error) {
 			err = msgp.WrapError(err, "PurgeTargets")
 			return
 		}
-		err = za0004.EncodeMsg(en)
+		err = (*replication.VersionPurgeStatusType)(&za0004).EncodeMsg(en)
 		if err != nil {
 			err = msgp.WrapError(err, "PurgeTargets", za0003)
 			return
@@ -1136,7 +1136,7 @@ func (z *ReplicationState) MarshalMsg(b []byte) (o []byte, err error) {
 	o = msgp.AppendMapHeader(o, uint32(len(z.PurgeTargets)))
 	for za0003, za0004 := range z.PurgeTargets {
 		o = msgp.AppendString(o, za0003)
-		o, err = za0004.MarshalMsg(o)
+		o, err = (*replication.VersionPurgeStatusType)(&za0004).MarshalMsg(o)
 		if err != nil {
 			err = msgp.WrapError(err, "PurgeTargets", za0003)
 			return
@@ -1261,7 +1261,7 @@ func (z *ReplicationState) UnmarshalMsg(bts []byte) (o []byte, err error) {
 					err = msgp.WrapError(err, "PurgeTargets")
 					return
 				}
-				bts, err = za0004.UnmarshalMsg(bts)
+				bts, err = (*replication.VersionPurgeStatusType)(&za0004).UnmarshalMsg(bts)
 				if err != nil {
 					err = msgp.WrapError(err, "PurgeTargets", za0003)
 					return
@@ -1321,7 +1321,7 @@ func (z *ReplicationState) Msgsize() (s int) {
 	if z.PurgeTargets != nil {
 		for za0003, za0004 := range z.PurgeTargets {
 			_ = za0004
-			s += msgp.StringPrefixSize + len(za0003) + za0004.Msgsize()
+			s += msgp.StringPrefixSize + len(za0003) + (*replication.VersionPurgeStatusType)(&za0004).Msgsize()
 		}
 	}
 	s += 17 + msgp.MapHeaderSize
diff --git a/cmd/iam-object-store.go b/cmd/iam-object-store.go
index 89931148d..7da764577 100644
--- a/cmd/iam-object-store.go
+++ b/cmd/iam-object-store.go
@@ -576,7 +576,7 @@ func (iamOS *IAMObjectStore) loadAllFromObjStore(ctx context.Context, cache *iam
 	if took := time.Since(listStartTime); took > maxIAMLoadOpTime {
 		var s strings.Builder
 		for k, v := range listedConfigItems {
-			s.WriteString(fmt.Sprintf("    %s: %d items\n", k, len(v)))
+			fmt.Fprintf(&s, "    %s: %d items\n", k, len(v))
 		}
 		logger.Info("listAllIAMConfigItems took %.2fs with contents:\n%s", took.Seconds(), s.String())
 	}
diff --git a/cmd/server_test.go b/cmd/server_test.go
index e69117351..8a4920de7 100644
--- a/cmd/server_test.go
+++ b/cmd/server_test.go
@@ -2128,7 +2128,7 @@ func (s *TestSuiteCommon) TestGetObjectLarge10MiB(c *check) {
 	1234567890,1234567890,1234567890,1234567890,1234567890,123"`
 	// Create 10MiB content where each line contains 1024 characters.
 	for i := range 10 * 1024 {
-		buffer.WriteString(fmt.Sprintf("[%05d] %s\n", i, line))
+		fmt.Fprintf(&buffer, "[%05d] %s\n", i, line)
 	}
 	putContent := buffer.String()
 
@@ -2190,7 +2190,7 @@ func (s *TestSuiteCommon) TestGetObjectLarge11MiB(c *check) {
 	1234567890,1234567890,1234567890,123`
 	// Create 11MiB content where each line contains 1024 characters.
 	for i := range 11 * 1024 {
-		buffer.WriteString(fmt.Sprintf("[%05d] %s\n", i, line))
+		fmt.Fprintf(&buffer, "[%05d] %s\n", i, line)
 	}
 	putMD5 := getMD5Hash(buffer.Bytes())
 
@@ -2341,7 +2341,7 @@ func (s *TestSuiteCommon) TestGetPartialObjectLarge11MiB(c *check) {
 	// Create 11MiB content where each line contains 1024
 	// characters.
 	for i := range 11 * 1024 {
-		buffer.WriteString(fmt.Sprintf("[%05d] %s\n", i, line))
+		fmt.Fprintf(&buffer, "[%05d] %s\n", i, line)
 	}
 	putContent := buffer.String()
 
@@ -2407,7 +2407,7 @@ func (s *TestSuiteCommon) TestGetPartialObjectLarge10MiB(c *check) {
 	1234567890,1234567890,1234567890,123`
 	// Create 10MiB content where each line contains 1024 characters.
 	for i := range 10 * 1024 {
-		buffer.WriteString(fmt.Sprintf("[%05d] %s\n", i, line))
+		fmt.Fprintf(&buffer, "[%05d] %s\n", i, line)
 	}
 
 	putContent := buffer.String()