diff --git a/cmd/erasure-multipart-fullobject_test.go b/cmd/erasure-multipart-fullobject_test.go
index 0bcb14c4f..b9d71aa21 100644
--- a/cmd/erasure-multipart-fullobject_test.go
+++ b/cmd/erasure-multipart-fullobject_test.go
@@ -420,8 +420,74 @@ func testAPICompleteMultipartChecksumTypeMismatch(obj ObjectLayer, instanceType,
 				t.Fatalf("%s: object was created despite a rejected checksum type", instanceType)
 			}
 		})
+
+		t.Run(test.name+"-type-only", func(t *testing.T) {
+			objectName := "type-mismatch/type-only-" + test.name
+			uploadID := newMultipartUploadHTTP(t, apiRouter, credentials, bucketName, objectName,
+				typ.String(), test.createdType)
+			etags := uploadPartsHTTP(t, apiRouter, credentials, bucketName, objectName, uploadID, typ, partData)
+			partCS := []string{mustChecksum(t, typ, partData[0]), mustChecksum(t, typ, partData[1])}
+			rec := completeMultipartUploadHTTP(t, apiRouter, credentials, bucketName, objectName, uploadID, etags, partCS,
+				map[string]string{xhttp.AmzChecksumType: test.providedType})
+			if rec.Code != http.StatusBadRequest {
+				t.Fatalf("%s: checksum type-only mismatch returned %d, want 400", instanceType, rec.Code)
+			}
+			apiErr := apiError(t, rec)
+			if apiErr.Code != "BadDigest" {
+				t.Fatalf("%s: expected BadDigest, got %q", instanceType, apiErr.Code)
+			}
+			wantMessage := fmt.Sprintf("The checksum type %s does not match the multipart upload checksum type %s.", test.providedType, test.createdType)
+			if apiErr.Message != wantMessage {
+				t.Fatalf("%s: expected message %q, got %q", instanceType, wantMessage, apiErr.Message)
+			}
+			if _, err := obj.GetObjectInfo(t.Context(), bucketName, objectName, ObjectOptions{}); err == nil {
+				t.Fatalf("%s: object was created despite a rejected checksum type-only assertion", instanceType)
+			}
+		})
 	}
 
+	for _, test := range []struct {
+		name         string
+		providedType string
+		withChecksum bool
+	}{
+		{name: "unknown-type-only", providedType: "NOT_A_TYPE"},
+		{name: "lowercase-type-only", providedType: "full_object"},
+		{name: "unknown-with-checksum", providedType: "NOT_A_TYPE", withChecksum: true},
+	} {
+		t.Run(test.name, func(t *testing.T) {
+			objectName := "type-mismatch/invalid-" + test.name
+			uploadID := newMultipartUploadHTTP(t, apiRouter, credentials, bucketName, objectName,
+				typ.String(), xhttp.AmzChecksumTypeComposite)
+			etags := uploadPartsHTTP(t, apiRouter, credentials, bucketName, objectName, uploadID, typ, partData)
+			partCS := []string{mustChecksum(t, typ, partData[0]), mustChecksum(t, typ, partData[1])}
+			headers := map[string]string{xhttp.AmzChecksumType: test.providedType}
+			if test.withChecksum {
+				headers[typ.Key()] = mustChecksum(t, typ, full)
+			}
+			rec := completeMultipartUploadHTTP(t, apiRouter, credentials, bucketName, objectName, uploadID, etags, partCS, headers)
+			if rec.Code != http.StatusBadRequest || apiErrorCode(t, rec) != "InvalidArgument" {
+				t.Fatalf("%s: invalid checksum type returned %d %s", instanceType, rec.Code, rec.Body.String())
+			}
+			if _, err := obj.GetObjectInfo(t.Context(), bucketName, objectName, ObjectOptions{}); err == nil {
+				t.Fatalf("%s: object was created despite an invalid checksum type", instanceType)
+			}
+		})
+	}
+
+	t.Run("matching-type-only", func(t *testing.T) {
+		objectName := "type-mismatch/matching-type-only"
+		uploadID := newMultipartUploadHTTP(t, apiRouter, credentials, bucketName, objectName,
+			typ.String(), xhttp.AmzChecksumTypeComposite)
+		etags := uploadPartsHTTP(t, apiRouter, credentials, bucketName, objectName, uploadID, typ, partData)
+		partCS := []string{mustChecksum(t, typ, partData[0]), mustChecksum(t, typ, partData[1])}
+		rec := completeMultipartUploadHTTP(t, apiRouter, credentials, bucketName, objectName, uploadID, etags, partCS,
+			map[string]string{xhttp.AmzChecksumType: xhttp.AmzChecksumTypeComposite})
+		if rec.Code != http.StatusOK {
+			t.Fatalf("%s: matching checksum type-only assertion returned %d %s", instanceType, rec.Code, rec.Body.String())
+		}
+	})
+
 	t.Run("omitted-type-is-not-composite", func(t *testing.T) {
 		objectName := "type-mismatch/omitted-type"
 		uploadID := newMultipartUploadHTTP(t, apiRouter, credentials, bucketName, objectName,
diff --git a/cmd/erasure-multipart.go b/cmd/erasure-multipart.go
index 222c458b5..d99492368 100644
--- a/cmd/erasure-multipart.go
+++ b/cmd/erasure-multipart.go
@@ -1173,9 +1173,9 @@ func (er erasureObjects) CompleteMultipartUpload(ctx context.Context, bucket str
 	var checksumType hash.ChecksumType
 	if cs := fi.Metadata[hash.MinIOMultipartChecksum]; cs != "" {
 		checksumType = hash.NewChecksumType(cs, fi.Metadata[hash.MinIOMultipartChecksumType])
+		expectedType := checksumType | hash.ChecksumMultipart | hash.ChecksumIncludesMultipart
 		if opts.WantChecksum != nil {
 			providedType := opts.WantChecksum.Type | hash.ChecksumMultipart | hash.ChecksumIncludesMultipart
-			expectedType := checksumType | hash.ChecksumMultipart | hash.ChecksumIncludesMultipart
 			if providedType.Base() != expectedType.Base() {
 				return oi, InvalidArgument{
 					Bucket: bucket,
@@ -1183,8 +1183,16 @@ func (er erasureObjects) CompleteMultipartUpload(ctx context.Context, bucket str
 					Err:    fmt.Errorf("checksum algorithm mismatch. got %q expected %q", providedType.String(), expectedType.String()),
 				}
 			}
-			if opts.wantChecksumTypeSet && providedType.ObjType() != expectedType.ObjType() {
-				return oi, completeMultipartChecksumTypeMismatch(providedType.ObjType(), expectedType.ObjType())
+		}
+		if opts.wantChecksumType != "" {
+			providedObjectType := opts.wantChecksumType
+			// CRC64NVME is always canonicalized to FULL_OBJECT. Preserve this
+			// behavior until its exact AWS wire semantics have been probed.
+			if checksumType.Base().Is(hash.ChecksumCRC64NVME) {
+				providedObjectType = xhttp.AmzChecksumTypeFullObject
+			}
+			if providedObjectType != expectedType.ObjType() {
+				return oi, completeMultipartChecksumTypeMismatch(opts.wantChecksumType, expectedType.ObjType())
 			}
 		}
 		checksumType |= hash.ChecksumMultipart | hash.ChecksumIncludesMultipart
diff --git a/cmd/object-api-interface.go b/cmd/object-api-interface.go
index 35d353ca6..f8664310d 100644
--- a/cmd/object-api-interface.go
+++ b/cmd/object-api-interface.go
@@ -84,8 +84,8 @@ type ObjectOptions struct {
 	Expiration          ExpirationOptions
 	LifecycleAuditEvent lcAuditEvent
 
-	WantChecksum        *hash.Checksum // x-amz-checksum-XXX checksum sent to PutObject/ CompleteMultipartUpload.
-	wantChecksumTypeSet bool           // x-amz-checksum-type was explicitly set on CompleteMultipartUpload.
+	WantChecksum     *hash.Checksum // x-amz-checksum-XXX checksum sent to PutObject/ CompleteMultipartUpload.
+	wantChecksumType string         // explicit x-amz-checksum-type value on CompleteMultipartUpload.
 
 	WantServerSideChecksumType hash.ChecksumType // if set, we compute a server-side checksum of this type
 
diff --git a/cmd/object-api-options.go b/cmd/object-api-options.go
index 828a8ff00..0d496e811 100644
--- a/cmd/object-api-options.go
+++ b/cmd/object-api-options.go
@@ -469,11 +469,17 @@ func completeMultipartOpts(ctx context.Context, r *http.Request, bucket, object
 		}
 	}
 
+	opts.wantChecksumType = r.Header.Get(xhttp.AmzChecksumType)
+	switch opts.wantChecksumType {
+	case "", xhttp.AmzChecksumTypeComposite, xhttp.AmzChecksumTypeFullObject:
+	default:
+		return opts, hash.ErrInvalidChecksum
+	}
+
 	opts.WantChecksum, err = hash.GetContentChecksum(r.Header)
 	if err != nil {
 		return opts, err
 	}
-	opts.wantChecksumTypeSet = r.Header.Get(xhttp.AmzChecksumType) != ""
 	opts.MTime = mtime
 	opts.UserDefined = make(map[string]string)
 	// Transfer SSEC key in opts.EncryptFn