diff --git a/tool/core/osap.js b/tool/core/osap.js
index 45e984c80614d4d61ec66acd238e82f47c9b0bef..9e5ec0a37c4f82b9b889f9c74619d5a898a30fbb 100644
--- a/tool/core/osap.js
+++ b/tool/core/osap.js
@@ -14,7 +14,7 @@ no warranty is provided, and users accept all liability.
 
 'use strict'
 
-import VPort from './vPort.js'
+import VPort from './vport.js'
 
 import { PK, DK, EP, TS, TIMES } from './ts.js'
 
diff --git a/tool/core/vport.js b/tool/core/vport.js
index 7bf86cd275e42558fffc355801210cd117890ac0..02d03003254c5a7f0c0fb0dbd54eb68097533680 100644
--- a/tool/core/vport.js
+++ b/tool/core/vport.js
@@ -1,5 +1,5 @@
 /*
-vPort.js
+vport.js
 
 virtual port, for osap