diff --git a/api-put-object.go b/api-put-object.go
index a792cfe39..dbb476a97 100644
--- a/api-put-object.go
+++ b/api-put-object.go
@@ -333,7 +333,7 @@ func (c *Client) putObjectCommon(ctx context.Context, bucketName, objectName str
 		return c.putObjectMultipartStreamNoLength(ctx, bucketName, objectName, reader, opts)
 	}
 
-	if size < int64(partSize) || opts.DisableMultipart {
+	if size <= int64(partSize) || opts.DisableMultipart {
 		return c.putObject(ctx, bucketName, objectName, reader, size, opts)
 	}