diff --git a/decor/size_type.go b/decor/size_type.go
index 57c09d9..0732093 100644
--- a/decor/size_type.go
+++ b/decor/size_type.go
@@ -74,7 +74,7 @@
 
 const (
 	_b  SizeB1000 = 1
-	_KB SizeB1000 = 1000
+	_KB SizeB1000 = _b * 1000
 	_MB SizeB1000 = _KB * 1000
 	_GB SizeB1000 = _MB * 1000
 	_TB SizeB1000 = _GB * 1000