diff --git a/src/client/hud.h b/src/client/hud.h
index 6274b1a83..e2abf326c 100644
--- a/src/client/hud.h
+++ b/src/client/hud.h
@@ -18,8 +18,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
-#ifndef CLIENT_HUD_HEADER
-#define CLIENT_HUD_HEADER
+#pragma once
 
 #include <vector>
 #include <IGUIFont.h>
@@ -147,4 +146,3 @@ void drawItemStack(
 		const v3s16 &angle,
 		const v3s16 &rotation_speed);
 
-#endif
diff --git a/src/client/render/factory.h b/src/client/render/factory.h
index 22738404a..e3339a836 100644
--- a/src/client/render/factory.h
+++ b/src/client/render/factory.h
@@ -18,6 +18,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
+#pragma once
+
 #include <string>
 #include "core.h"
 
diff --git a/src/gui/guiButtonImage.h b/src/gui/guiButtonImage.h
index a948d772b..59a25b4f0 100644
--- a/src/gui/guiButtonImage.h
+++ b/src/gui/guiButtonImage.h
@@ -17,6 +17,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
+#pragma once
+
 #include "guiButton.h"
 #include "IGUIButton.h"
 
diff --git a/src/gui/guiButtonItemImage.h b/src/gui/guiButtonItemImage.h
index 9cd0f6188..aad923bda 100644
--- a/src/gui/guiButtonItemImage.h
+++ b/src/gui/guiButtonItemImage.h
@@ -17,6 +17,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
+#pragma once
+
 #include "guiButton.h"
 #include "IGUIButton.h"
 
diff --git a/src/hud.h b/src/hud.h
index bab420ed2..e015baec1 100644
--- a/src/hud.h
+++ b/src/hud.h
@@ -18,8 +18,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
-#ifndef HUD_HEADER
-#define HUD_HEADER
+#pragma once
 
 #include "irrlichttypes_extrabloated.h"
 #include <string>
@@ -101,4 +100,3 @@ extern const EnumString es_HudElementType[];
 extern const EnumString es_HudElementStat[];
 extern const EnumString es_HudBuiltinElement[];
 
-#endif
diff --git a/src/script/lua_api/l_particles_local.h b/src/script/lua_api/l_particles_local.h
index 5dff153b3..d8bb2b1c6 100644
--- a/src/script/lua_api/l_particles_local.h
+++ b/src/script/lua_api/l_particles_local.h
@@ -18,6 +18,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
+#pragma once
+
 #include "lua_api/l_base.h"
 
 class ModApiParticlesLocal : public ModApiBase
diff --git a/src/util/md32_common.h b/src/util/md32_common.h
index 085d1d7a5..a4c2099c9 100644
--- a/src/util/md32_common.h
+++ b/src/util/md32_common.h
@@ -109,6 +109,8 @@
  *                                      <appro@fy.chalmers.se>
  */
 
+#pragma once
+
 #if !defined(DATA_ORDER_IS_BIG_ENDIAN) && !defined(DATA_ORDER_IS_LITTLE_ENDIAN)
 # error "DATA_ORDER must be defined!"
 #endif