diff --git a/GUI/extenwindow.h b/GUI/extenwindow.h
index aa99ebf..4876c1e 100644
--- a/GUI/extenwindow.h
+++ b/GUI/extenwindow.h
@@ -1,5 +1,4 @@
-#ifndef EXTENSIONS_H
-#define EXTENSIONS_H
+#pragma once
 
 #include "qtcommon.h"
 #include <QListWidget>
@@ -35,5 +34,3 @@ private:
 	Ui::ExtenWindow* ui;
 	QListWidget* extenList;
 };
-
-#endif // EXTENSIONS_H
diff --git a/GUI/mainwindow.h b/GUI/mainwindow.h
index 1d94bc3..da9a7bb 100644
--- a/GUI/mainwindow.h
+++ b/GUI/mainwindow.h
@@ -1,5 +1,4 @@
-#ifndef MAINWINDOW_H
-#define MAINWINDOW_H
+#pragma once
 
 #include "qtcommon.h"
 #include "host/host.h"
@@ -50,5 +49,3 @@ private:
 	QPlainTextEdit* textOutput;
 	QWidget* extenWindow;
 };
-
-#endif // MAINWINDOW_H
diff --git a/GUI/misc.h b/GUI/misc.h
index 4120a3e..7ba0b1a 100644
--- a/GUI/misc.h
+++ b/GUI/misc.h
@@ -1,5 +1,4 @@
-#ifndef MISC_H
-#define MISC_H
+#pragma once
 
 #include "qtcommon.h"
 #include "types.h"
@@ -16,5 +15,3 @@ private:
 QMultiHash<QString, DWORD> GetAllProcesses();
 std::optional<HookParam> ParseCode(QString HCode);
 QString GenerateCode(HookParam hp, DWORD processId);
-
-#endif // MISC_H
diff --git a/GUI/setdialog.h b/GUI/setdialog.h
index ae7937c..4f9ecb7 100644
--- a/GUI/setdialog.h
+++ b/GUI/setdialog.h
@@ -1,5 +1,4 @@
-#ifndef SETDIALOG_H
-#define SETDIALOG_H
+#pragma once
 
 #include "qtcommon.h"
 #include <QSpinBox>
@@ -26,5 +25,3 @@ private:
 	QSpinBox* maxBufferSize;
 	QSpinBox* defaultCodepage;
 };
-
-#endif // SETDIALOG_H