diff --git a/CHANGELOG.md b/CHANGELOG.md
index 80012c6..3d09b11 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 # Changelog
 This is the changelog for NeoFS Proto
 
+## [0.2.12] - 2020-01-27
+
+### Fixed
+- Bug with ByteSize (0 bytes returns NaN)
+
 ## [0.2.11] - 2020-01-21
 
 ### Added
@@ -118,3 +123,4 @@ Initial public release
 [0.2.9]: https://github.com/nspcc-dev/neofs-proto/compare/v0.2.8...v0.2.9
 [0.2.10]: https://github.com/nspcc-dev/neofs-proto/compare/v0.2.9...v0.2.10
 [0.2.11]: https://github.com/nspcc-dev/neofs-proto/compare/v0.2.10...v0.2.11
+[0.2.12]: https://github.com/nspcc-dev/neofs-proto/compare/v0.2.11...v0.2.12
diff --git a/object/service.go b/object/service.go
index 8482539..38dbee1 100644
--- a/object/service.go
+++ b/object/service.go
@@ -39,8 +39,8 @@ type (
 )
 
 const (
-	// UnitsB starts enum for amount of bytes.
-	UnitsB int64 = 1 << (10 * iota)
+	// starts enum for amount of bytes.
+	_ int64 = 1 << (10 * iota)
 
 	// UnitsKB defines amount of bytes in one kilobyte.
 	UnitsKB
diff --git a/object/utils.go b/object/utils.go
index fab7fcc..7e628f1 100644
--- a/object/utils.go
+++ b/object/utils.go
@@ -32,7 +32,7 @@ func (b ByteSize) String() string {
 	case num > UnitsKB:
 		unit = "KB"
 		dec = UnitsKB
-	case num > UnitsB:
+	default:
 		dec = 1
 	}
 
diff --git a/object/utils_test.go b/object/utils_test.go
index a3f0162..d4d7fe2 100644
--- a/object/utils_test.go
+++ b/object/utils_test.go
@@ -7,11 +7,16 @@ import (
 )
 
 func TestByteSize_String(t *testing.T) {
-	var cases = []struct {
+	cases := []struct {
 		name   string
 		expect string
 		actual ByteSize
 	}{
+		{
+			name:   "0 bytes",
+			expect: "0",
+			actual: ByteSize(0),
+		},
 		{
 			name:   "101 bytes",
 			expect: "101",