diff --git a/cmd/api-response.go b/cmd/api-response.go
index ea70eac5c..7d44717c1 100644
--- a/cmd/api-response.go
+++ b/cmd/api-response.go
@@ -166,10 +166,10 @@ type Part struct {
 	Size         int64
 
 	// Checksum values
-	ChecksumCRC32  string
-	ChecksumCRC32C string
-	ChecksumSHA1   string
-	ChecksumSHA256 string
+	ChecksumCRC32  string `xml:"ChecksumCRC32,omitempty"`
+	ChecksumCRC32C string `xml:"ChecksumCRC32C,omitempty"`
+	ChecksumSHA1   string `xml:"ChecksumSHA1,omitempty"`
+	ChecksumSHA256 string `xml:"ChecksumSHA256,omitempty"`
 }
 
 // ListPartsResponse - format for list parts response.
@@ -403,10 +403,10 @@ type CompleteMultipartUploadResponse struct {
 	Key      string
 	ETag     string
 
-	ChecksumCRC32  string
-	ChecksumCRC32C string
-	ChecksumSHA1   string
-	ChecksumSHA256 string
+	ChecksumCRC32  string `xml:"ChecksumCRC32,omitempty"`
+	ChecksumCRC32C string `xml:"ChecksumCRC32C,omitempty"`
+	ChecksumSHA1   string `xml:"ChecksumSHA1,omitempty"`
+	ChecksumSHA256 string `xml:"ChecksumSHA256,omitempty"`
 }
 
 // DeleteError structure.