diff --git a/examples/application1/exampleapp.h b/examples/application1/exampleapp.h
index f7b837fbd5..2d866c689c 100644
--- a/examples/application1/exampleapp.h
+++ b/examples/application1/exampleapp.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPP_H
-#define __EXAMPLEAPP_H
+#pragma once
 
 #include <gtk/gtk.h>
 
@@ -8,6 +7,3 @@
 G_DECLARE_FINAL_TYPE (ExampleApp, example_app, EXAMPLE, APP, GtkApplication)
 
 ExampleApp     *example_app_new         (void);
-
-
-#endif /* __EXAMPLEAPP_H */
diff --git a/examples/application1/exampleappwin.h b/examples/application1/exampleappwin.h
index 786338d083..00758f6187 100644
--- a/examples/application1/exampleappwin.h
+++ b/examples/application1/exampleappwin.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPWIN_H
-#define __EXAMPLEAPPWIN_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleapp.h"
@@ -12,6 +11,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppWindow, example_app_window, EXAMPLE, APP_WINDOW,
 ExampleAppWindow       *example_app_window_new          (ExampleApp *app);
 void                    example_app_window_open         (ExampleAppWindow *win,
                                                          GFile            *file);
-
-
-#endif /* __EXAMPLEAPPWIN_H */
diff --git a/examples/application2/exampleapp.h b/examples/application2/exampleapp.h
index 51093791a3..fdbf91befc 100644
--- a/examples/application2/exampleapp.h
+++ b/examples/application2/exampleapp.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPP_H
-#define __EXAMPLEAPP_H
+#pragma once
 
 #include <gtk/gtk.h>
 
@@ -9,6 +8,3 @@ G_DECLARE_FINAL_TYPE (ExampleApp, example_app, EXAMPLE, APP, GtkApplication)
 
 
 ExampleApp     *example_app_new         (void);
-
-
-#endif /* __EXAMPLEAPP_H */
diff --git a/examples/application2/exampleappwin.h b/examples/application2/exampleappwin.h
index 786338d083..00758f6187 100644
--- a/examples/application2/exampleappwin.h
+++ b/examples/application2/exampleappwin.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPWIN_H
-#define __EXAMPLEAPPWIN_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleapp.h"
@@ -12,6 +11,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppWindow, example_app_window, EXAMPLE, APP_WINDOW,
 ExampleAppWindow       *example_app_window_new          (ExampleApp *app);
 void                    example_app_window_open         (ExampleAppWindow *win,
                                                          GFile            *file);
-
-
-#endif /* __EXAMPLEAPPWIN_H */
diff --git a/examples/application3/exampleapp.h b/examples/application3/exampleapp.h
index 51093791a3..fdbf91befc 100644
--- a/examples/application3/exampleapp.h
+++ b/examples/application3/exampleapp.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPP_H
-#define __EXAMPLEAPP_H
+#pragma once
 
 #include <gtk/gtk.h>
 
@@ -9,6 +8,3 @@ G_DECLARE_FINAL_TYPE (ExampleApp, example_app, EXAMPLE, APP, GtkApplication)
 
 
 ExampleApp     *example_app_new         (void);
-
-
-#endif /* __EXAMPLEAPP_H */
diff --git a/examples/application3/exampleappwin.h b/examples/application3/exampleappwin.h
index 786338d083..00758f6187 100644
--- a/examples/application3/exampleappwin.h
+++ b/examples/application3/exampleappwin.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPWIN_H
-#define __EXAMPLEAPPWIN_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleapp.h"
@@ -12,6 +11,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppWindow, example_app_window, EXAMPLE, APP_WINDOW,
 ExampleAppWindow       *example_app_window_new          (ExampleApp *app);
 void                    example_app_window_open         (ExampleAppWindow *win,
                                                          GFile            *file);
-
-
-#endif /* __EXAMPLEAPPWIN_H */
diff --git a/examples/application4/exampleapp.h b/examples/application4/exampleapp.h
index 51093791a3..fdbf91befc 100644
--- a/examples/application4/exampleapp.h
+++ b/examples/application4/exampleapp.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPP_H
-#define __EXAMPLEAPP_H
+#pragma once
 
 #include <gtk/gtk.h>
 
@@ -9,6 +8,3 @@ G_DECLARE_FINAL_TYPE (ExampleApp, example_app, EXAMPLE, APP, GtkApplication)
 
 
 ExampleApp     *example_app_new         (void);
-
-
-#endif /* __EXAMPLEAPP_H */
diff --git a/examples/application4/exampleappwin.h b/examples/application4/exampleappwin.h
index 786338d083..00758f6187 100644
--- a/examples/application4/exampleappwin.h
+++ b/examples/application4/exampleappwin.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPWIN_H
-#define __EXAMPLEAPPWIN_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleapp.h"
@@ -12,6 +11,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppWindow, example_app_window, EXAMPLE, APP_WINDOW,
 ExampleAppWindow       *example_app_window_new          (ExampleApp *app);
 void                    example_app_window_open         (ExampleAppWindow *win,
                                                          GFile            *file);
-
-
-#endif /* __EXAMPLEAPPWIN_H */
diff --git a/examples/application5/exampleapp.h b/examples/application5/exampleapp.h
index 51093791a3..fdbf91befc 100644
--- a/examples/application5/exampleapp.h
+++ b/examples/application5/exampleapp.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPP_H
-#define __EXAMPLEAPP_H
+#pragma once
 
 #include <gtk/gtk.h>
 
@@ -9,6 +8,3 @@ G_DECLARE_FINAL_TYPE (ExampleApp, example_app, EXAMPLE, APP, GtkApplication)
 
 
 ExampleApp     *example_app_new         (void);
-
-
-#endif /* __EXAMPLEAPP_H */
diff --git a/examples/application5/exampleappwin.h b/examples/application5/exampleappwin.h
index 786338d083..00758f6187 100644
--- a/examples/application5/exampleappwin.h
+++ b/examples/application5/exampleappwin.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPWIN_H
-#define __EXAMPLEAPPWIN_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleapp.h"
@@ -12,6 +11,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppWindow, example_app_window, EXAMPLE, APP_WINDOW,
 ExampleAppWindow       *example_app_window_new          (ExampleApp *app);
 void                    example_app_window_open         (ExampleAppWindow *win,
                                                          GFile            *file);
-
-
-#endif /* __EXAMPLEAPPWIN_H */
diff --git a/examples/application6/exampleapp.h b/examples/application6/exampleapp.h
index 51093791a3..fdbf91befc 100644
--- a/examples/application6/exampleapp.h
+++ b/examples/application6/exampleapp.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPP_H
-#define __EXAMPLEAPP_H
+#pragma once
 
 #include <gtk/gtk.h>
 
@@ -9,6 +8,3 @@ G_DECLARE_FINAL_TYPE (ExampleApp, example_app, EXAMPLE, APP, GtkApplication)
 
 
 ExampleApp     *example_app_new         (void);
-
-
-#endif /* __EXAMPLEAPP_H */
diff --git a/examples/application6/exampleappprefs.h b/examples/application6/exampleappprefs.h
index 2f08819ffb..b7a8df14df 100644
--- a/examples/application6/exampleappprefs.h
+++ b/examples/application6/exampleappprefs.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPPREFS_H
-#define __EXAMPLEAPPPREFS_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleappwin.h"
@@ -10,6 +9,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppPrefs, example_app_prefs, EXAMPLE, APP_PREFS, Gt
 
 
 ExampleAppPrefs        *example_app_prefs_new          (ExampleAppWindow *win);
-
-
-#endif /* __EXAMPLEAPPPREFS_H */
diff --git a/examples/application6/exampleappwin.h b/examples/application6/exampleappwin.h
index 786338d083..00758f6187 100644
--- a/examples/application6/exampleappwin.h
+++ b/examples/application6/exampleappwin.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPWIN_H
-#define __EXAMPLEAPPWIN_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleapp.h"
@@ -12,6 +11,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppWindow, example_app_window, EXAMPLE, APP_WINDOW,
 ExampleAppWindow       *example_app_window_new          (ExampleApp *app);
 void                    example_app_window_open         (ExampleAppWindow *win,
                                                          GFile            *file);
-
-
-#endif /* __EXAMPLEAPPWIN_H */
diff --git a/examples/application7/exampleapp.h b/examples/application7/exampleapp.h
index 51093791a3..fdbf91befc 100644
--- a/examples/application7/exampleapp.h
+++ b/examples/application7/exampleapp.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPP_H
-#define __EXAMPLEAPP_H
+#pragma once
 
 #include <gtk/gtk.h>
 
@@ -9,6 +8,3 @@ G_DECLARE_FINAL_TYPE (ExampleApp, example_app, EXAMPLE, APP, GtkApplication)
 
 
 ExampleApp     *example_app_new         (void);
-
-
-#endif /* __EXAMPLEAPP_H */
diff --git a/examples/application7/exampleappprefs.h b/examples/application7/exampleappprefs.h
index 2f08819ffb..b7a8df14df 100644
--- a/examples/application7/exampleappprefs.h
+++ b/examples/application7/exampleappprefs.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPPREFS_H
-#define __EXAMPLEAPPPREFS_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleappwin.h"
@@ -10,6 +9,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppPrefs, example_app_prefs, EXAMPLE, APP_PREFS, Gt
 
 
 ExampleAppPrefs        *example_app_prefs_new          (ExampleAppWindow *win);
-
-
-#endif /* __EXAMPLEAPPPREFS_H */
diff --git a/examples/application7/exampleappwin.h b/examples/application7/exampleappwin.h
index 786338d083..00758f6187 100644
--- a/examples/application7/exampleappwin.h
+++ b/examples/application7/exampleappwin.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPWIN_H
-#define __EXAMPLEAPPWIN_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleapp.h"
@@ -12,6 +11,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppWindow, example_app_window, EXAMPLE, APP_WINDOW,
 ExampleAppWindow       *example_app_window_new          (ExampleApp *app);
 void                    example_app_window_open         (ExampleAppWindow *win,
                                                          GFile            *file);
-
-
-#endif /* __EXAMPLEAPPWIN_H */
diff --git a/examples/application8/exampleapp.h b/examples/application8/exampleapp.h
index 51093791a3..fdbf91befc 100644
--- a/examples/application8/exampleapp.h
+++ b/examples/application8/exampleapp.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPP_H
-#define __EXAMPLEAPP_H
+#pragma once
 
 #include <gtk/gtk.h>
 
@@ -9,6 +8,3 @@ G_DECLARE_FINAL_TYPE (ExampleApp, example_app, EXAMPLE, APP, GtkApplication)
 
 
 ExampleApp     *example_app_new         (void);
-
-
-#endif /* __EXAMPLEAPP_H */
diff --git a/examples/application8/exampleappprefs.h b/examples/application8/exampleappprefs.h
index 2f08819ffb..b7a8df14df 100644
--- a/examples/application8/exampleappprefs.h
+++ b/examples/application8/exampleappprefs.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPPREFS_H
-#define __EXAMPLEAPPPREFS_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleappwin.h"
@@ -10,6 +9,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppPrefs, example_app_prefs, EXAMPLE, APP_PREFS, Gt
 
 
 ExampleAppPrefs        *example_app_prefs_new          (ExampleAppWindow *win);
-
-
-#endif /* __EXAMPLEAPPPREFS_H */
diff --git a/examples/application8/exampleappwin.h b/examples/application8/exampleappwin.h
index 786338d083..00758f6187 100644
--- a/examples/application8/exampleappwin.h
+++ b/examples/application8/exampleappwin.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPWIN_H
-#define __EXAMPLEAPPWIN_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleapp.h"
@@ -12,6 +11,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppWindow, example_app_window, EXAMPLE, APP_WINDOW,
 ExampleAppWindow       *example_app_window_new          (ExampleApp *app);
 void                    example_app_window_open         (ExampleAppWindow *win,
                                                          GFile            *file);
-
-
-#endif /* __EXAMPLEAPPWIN_H */
diff --git a/examples/application9/exampleapp.h b/examples/application9/exampleapp.h
index 51093791a3..fdbf91befc 100644
--- a/examples/application9/exampleapp.h
+++ b/examples/application9/exampleapp.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPP_H
-#define __EXAMPLEAPP_H
+#pragma once
 
 #include <gtk/gtk.h>
 
@@ -9,6 +8,3 @@ G_DECLARE_FINAL_TYPE (ExampleApp, example_app, EXAMPLE, APP, GtkApplication)
 
 
 ExampleApp     *example_app_new         (void);
-
-
-#endif /* __EXAMPLEAPP_H */
diff --git a/examples/application9/exampleappprefs.h b/examples/application9/exampleappprefs.h
index 2f08819ffb..b7a8df14df 100644
--- a/examples/application9/exampleappprefs.h
+++ b/examples/application9/exampleappprefs.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPPREFS_H
-#define __EXAMPLEAPPPREFS_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleappwin.h"
@@ -10,6 +9,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppPrefs, example_app_prefs, EXAMPLE, APP_PREFS, Gt
 
 
 ExampleAppPrefs        *example_app_prefs_new          (ExampleAppWindow *win);
-
-
-#endif /* __EXAMPLEAPPPREFS_H */
diff --git a/examples/application9/exampleappwin.h b/examples/application9/exampleappwin.h
index 786338d083..00758f6187 100644
--- a/examples/application9/exampleappwin.h
+++ b/examples/application9/exampleappwin.h
@@ -1,5 +1,4 @@
-#ifndef __EXAMPLEAPPWIN_H
-#define __EXAMPLEAPPWIN_H
+#pragma once
 
 #include <gtk/gtk.h>
 #include "exampleapp.h"
@@ -12,6 +11,3 @@ G_DECLARE_FINAL_TYPE (ExampleAppWindow, example_app_window, EXAMPLE, APP_WINDOW,
 ExampleAppWindow       *example_app_window_new          (ExampleApp *app);
 void                    example_app_window_open         (ExampleAppWindow *win,
                                                          GFile            *file);
-
-
-#endif /* __EXAMPLEAPPWIN_H */