diff --git a/src/main/java/istlab/KisoJikken/JExecutor.java b/src/main/java/istlab/KisoJikken/JExecutor.java
index ddfa0d0..ec1478e 100644
--- a/src/main/java/istlab/KisoJikken/JExecutor.java
+++ b/src/main/java/istlab/KisoJikken/JExecutor.java
@@ -44,7 +44,7 @@
     @Override
     public void run() {
         ArrayList<String> comlist = new ArrayList<String>();
-        comlist.add("java");
+        comlist.add("java -Dfile.encoding=UTF8 ");
         comlist.add(pkgname + "." + javafname);
         // コマンドラインオプションをtrimした結果が空文字列なら追加しない
         if (commandLineOption.trim().length() > 0) {