diff --git a/cmd/object-api-errors.go b/cmd/object-api-errors.go
index 847b0366e..40466efb8 100644
--- a/cmd/object-api-errors.go
+++ b/cmd/object-api-errors.go
@@ -337,7 +337,7 @@ type PartTooSmall struct {
 }
 
 func (e PartTooSmall) Error() string {
-	return fmt.Sprintf("Part size for %d should be atleast 5MB", e.PartNumber)
+	return fmt.Sprintf("Part size for %d should be at least 5MB", e.PartNumber)
 }
 
 // PartTooBig returned if size of part is bigger than the allowed limit.