diff --git a/ImportConfig.cpp b/ImportConfig.cpp
index f453785..1a0404b 100644
--- a/ImportConfig.cpp
+++ b/ImportConfig.cpp
@@ -100,9 +100,8 @@ void CImportConfig::on_pushButton_confirm_clicked()
     file.open(QIODevice::ReadWrite | QIODevice::Text);
     value = file.readAll();
     file.resize(0);
-    file.write(value.toUtf8());
     value.replace(oldMAC,MAC);
-    value = file.readAll();
+    file.write(value.toUtf8());
     file.close();