diff --git a/hecl-gui/Common.hpp b/hecl-gui/Common.hpp
index f2265ab10..a1a63d9f3 100644
--- a/hecl-gui/Common.hpp
+++ b/hecl-gui/Common.hpp
@@ -1,5 +1,4 @@
-#ifndef GUI_COMMON_HPP
-#define GUI_COMMON_HPP
+#pragma once
 
 #include <QString>
 #include <QMetaType>
@@ -77,4 +76,3 @@ Q_DECLARE_METATYPE(URDEVersion);
 
 void InitializePlatform();
 
-#endif // GUI_COMMON_HPP
diff --git a/hecl-gui/DownloadManager.hpp b/hecl-gui/DownloadManager.hpp
index 44f504a04..b05596739 100644
--- a/hecl-gui/DownloadManager.hpp
+++ b/hecl-gui/DownloadManager.hpp
@@ -1,5 +1,4 @@
-#ifndef GUI_DOWNLOADMANAGER_HPP
-#define GUI_DOWNLOADMANAGER_HPP
+#pragma once
 
 #include <QObject>
 #include <QtNetwork>
@@ -71,4 +70,3 @@ public slots:
 
 };
 
-#endif // GUI_DOWNLOADMANAGER_HPP
diff --git a/hecl-gui/ErrorLabel.hpp b/hecl-gui/ErrorLabel.hpp
index 79c58bdc4..be4cabcd8 100644
--- a/hecl-gui/ErrorLabel.hpp
+++ b/hecl-gui/ErrorLabel.hpp
@@ -1,5 +1,4 @@
-#ifndef GUI_ERRORLABEL_HPP
-#define GUI_ERRORLABEL_HPP
+#pragma once
 
 #include <QLabel>
 
@@ -19,4 +18,3 @@ public:
     }
 };
 
-#endif // GUI_ERRORLABEL_HPP
diff --git a/hecl-gui/EscapeSequenceParser.hpp b/hecl-gui/EscapeSequenceParser.hpp
index af915612c..729f9671f 100644
--- a/hecl-gui/EscapeSequenceParser.hpp
+++ b/hecl-gui/EscapeSequenceParser.hpp
@@ -1,5 +1,4 @@
-#ifndef GUI_ESCAPESEQUENCEPARSER_HPP
-#define GUI_ESCAPESEQUENCEPARSER_HPP
+#pragma once
 
 #include <QString>
 #include <QTextCharFormat>
@@ -12,4 +11,3 @@ void ReturnInsert(QTextCursor& cur, const QString& text);
 
 void ReturnInsert(QTextCursor& cur, const QString& text, const QTextCharFormat& format);
 
-#endif // GUI_ESCAPESEQUENCEPARSER_HPP
diff --git a/hecl-gui/ExtractZip.hpp b/hecl-gui/ExtractZip.hpp
index 744cc7cc8..4dfc1b9f7 100644
--- a/hecl-gui/ExtractZip.hpp
+++ b/hecl-gui/ExtractZip.hpp
@@ -1,5 +1,4 @@
-#ifndef GUI_EXTRACTZIP_HPP
-#define GUI_EXTRACTZIP_HPP
+#pragma once
 
 class QStringList;
 class QuaZip;
@@ -13,4 +12,3 @@ public:
     static bool extractDir(QuaZip& zip, QString dir);
 };
 
-#endif // GUI_EXTRACTZIP_HPP
diff --git a/hecl-gui/FileDirDialog.hpp b/hecl-gui/FileDirDialog.hpp
index bedcaf8e6..240725c46 100644
--- a/hecl-gui/FileDirDialog.hpp
+++ b/hecl-gui/FileDirDialog.hpp
@@ -1,5 +1,4 @@
-#ifndef FILEDIRDIALOG_HPP
-#define FILEDIRDIALOG_HPP
+#pragma once
 
 #include <QFileDialog>
 
@@ -10,4 +9,3 @@ public:
     FileDirDialog(QWidget* parent = nullptr) : QFileDialog(parent) { setFileMode(QFileDialog::Directory); }
 };
 
-#endif // FILEDIRDIALOG_HPP
diff --git a/hecl-gui/FindBlender.hpp b/hecl-gui/FindBlender.hpp
index 186fe9253..d5420795d 100644
--- a/hecl-gui/FindBlender.hpp
+++ b/hecl-gui/FindBlender.hpp
@@ -1,5 +1,4 @@
-#ifndef FINDBLENDER_HPP
-#define FINDBLENDER_HPP
+#pragma once
 
 #include "hecl/hecl.hpp"
 
@@ -10,4 +9,3 @@ hecl::SystemString FindBlender(int& major, int& minor);
 
 }
 
-#endif // FINDBLENDER_HPP
diff --git a/hecl-gui/LaunchMenu.hpp b/hecl-gui/LaunchMenu.hpp
index 3000f5b5a..13aebfebb 100644
--- a/hecl-gui/LaunchMenu.hpp
+++ b/hecl-gui/LaunchMenu.hpp
@@ -1,5 +1,4 @@
-#ifndef GUI_LAUNCHMENU_HPP
-#define GUI_LAUNCHMENU_HPP
+#pragma once
 
 #include <QMenu>
 namespace hecl { struct CVarCommons; }
@@ -34,4 +33,3 @@ public slots:
     void developerModeTriggered();
 };
 
-#endif // GUI_LAUNCHMENU_HPP
diff --git a/hecl-gui/MacOSSystemVersion.hpp b/hecl-gui/MacOSSystemVersion.hpp
index 56cfea455..ae4e122d4 100644
--- a/hecl-gui/MacOSSystemVersion.hpp
+++ b/hecl-gui/MacOSSystemVersion.hpp
@@ -1,6 +1,4 @@
-#ifndef GUI_MACOSSYSTEMVERSION_HPP
-#define GUI_MACOSSYSTEMVERSION_HPP
+#pragma once
 
 void GetMacOSSystemVersion(int& major, int& minor, int& patch);
 
-#endif // GUI_MACOSSYSTEMVERSION_HPP
diff --git a/hecl-gui/MainWindow.hpp b/hecl-gui/MainWindow.hpp
index c0f6f9766..329219c38 100644
--- a/hecl-gui/MainWindow.hpp
+++ b/hecl-gui/MainWindow.hpp
@@ -1,5 +1,4 @@
-#ifndef MAINWINDOW_HPP
-#define MAINWINDOW_HPP
+#pragma once
 
 #include <QMainWindow>
 #include <QProcess>
@@ -65,4 +64,3 @@ private:
     bool isPackageComplete() const;
 };
 
-#endif // MAINWINDOW_HPP
diff --git a/hecl-gui/SysReqTableView.hpp b/hecl-gui/SysReqTableView.hpp
index 778689ab2..8bf752b5a 100644
--- a/hecl-gui/SysReqTableView.hpp
+++ b/hecl-gui/SysReqTableView.hpp
@@ -1,5 +1,4 @@
-#ifndef GUI_SYSREQTABLEVIEW_HPP
-#define GUI_SYSREQTABLEVIEW_HPP
+#pragma once
 
 #include <QTableView>
 #include "VectorISATableView.hpp"
@@ -57,4 +56,3 @@ public:
     void updateFreeDiskSpace(const QString& path) { m_model.updateFreeDiskSpace(path); }
 };
 
-#endif // GUI_SYSREQTABLEVIEW_HPP
diff --git a/hecl-gui/VectorISATableModel.hpp b/hecl-gui/VectorISATableModel.hpp
index 46578f0dc..d7f1471b0 100644
--- a/hecl-gui/VectorISATableModel.hpp
+++ b/hecl-gui/VectorISATableModel.hpp
@@ -1,5 +1,4 @@
-#ifndef GUI_VECTORISATABLEMODEL_HPP
-#define GUI_VECTORISATABLEMODEL_HPP
+#pragma once
 
 #include <QTableView>
 #include "zeus/Math.hpp"
@@ -14,4 +13,3 @@ public:
     int rowCount(const QModelIndex& parent = QModelIndex()) const { return 1; }
 };
 
-#endif // GUI_VECTORISATABLEMODEL_HPP
diff --git a/hecl-gui/VectorISATableModelIntel.hpp b/hecl-gui/VectorISATableModelIntel.hpp
index c8dbdcdfa..0f11b0a0a 100644
--- a/hecl-gui/VectorISATableModelIntel.hpp
+++ b/hecl-gui/VectorISATableModelIntel.hpp
@@ -1,5 +1,4 @@
-#ifndef GUI_VECTORISATABLEMODELINTEL_HPP
-#define GUI_VECTORISATABLEMODELINTEL_HPP
+#pragma once
 
 #include "VectorISATableModel.hpp"
 
@@ -107,4 +106,3 @@ public:
     }
 };
 
-#endif // GUI_VECTORISATABLEMODELINTEL_HPP
diff --git a/hecl-gui/VectorISATableView.hpp b/hecl-gui/VectorISATableView.hpp
index d697d0079..fb10d8953 100644
--- a/hecl-gui/VectorISATableView.hpp
+++ b/hecl-gui/VectorISATableView.hpp
@@ -1,5 +1,4 @@
-#ifndef GUI_VECTORISATABLEVIEW_HPP
-#define GUI_VECTORISATABLEVIEW_HPP
+#pragma once
 
 #include <QTableView>
 #include "Common.hpp"
@@ -25,4 +24,3 @@ public:
     bool willRun(VectorISA visa) const { return m_model.willRun(visa); }
 };
 
-#endif // GUI_VECTORISATABLEVIEW_HPP