diff --git a/src/openrct2-ui/Ui.h b/src/openrct2-ui/Ui.h
index 3922630fb5..cc0f0077cd 100644
--- a/src/openrct2-ui/Ui.h
+++ b/src/openrct2-ui/Ui.h
@@ -7,6 +7,8 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
+#pragma once
+
 #ifdef _MSC_VER
 int NormalisedMain(int argc, const char** argv);
 #endif
diff --git a/src/openrct2/Cheats.h b/src/openrct2/Cheats.h
index 4f36817073..47653acd6b 100644
--- a/src/openrct2/Cheats.h
+++ b/src/openrct2/Cheats.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _CHEATS_H_
-#define _CHEATS_H_
+#pragma once
 
 #include "common.h"
 
@@ -120,5 +119,3 @@ void CheatsReset();
 const char* CheatsGetName(CheatType cheatType);
 void CheatsSet(CheatType cheatType, int32_t param1 = 0, int32_t param2 = 0);
 void CheatsSerialise(class DataSerialiser& ds);
-
-#endif
diff --git a/src/openrct2/CmdlineSprite.h b/src/openrct2/CmdlineSprite.h
index 58227cc23e..e9f4e65686 100644
--- a/src/openrct2/CmdlineSprite.h
+++ b/src/openrct2/CmdlineSprite.h
@@ -7,12 +7,9 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _CMDLINE_SPRITE_H_
-#define _CMDLINE_SPRITE_H_
+#pragma once
 
 #include "common.h"
 
 int32_t cmdline_for_sprite(const char** argv, int32_t argc);
 extern int32_t gSpriteMode;
-
-#endif
diff --git a/src/openrct2/Input.h b/src/openrct2/Input.h
index c27addc3da..0de27cf7d4 100644
--- a/src/openrct2/Input.h
+++ b/src/openrct2/Input.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _INPUT_H_
-#define _INPUT_H_
+#pragma once
 
 #include "interface/Window.h"
 
@@ -117,5 +116,3 @@ void reset_tooltip_not_shown();
 void input_reset_place_obj_modifier();
 
 void InputScrollViewport(const ScreenCoordsXY& screenCoords);
-
-#endif
diff --git a/src/openrct2/Intro.h b/src/openrct2/Intro.h
index 70e9592fe3..8fbf9f9c27 100644
--- a/src/openrct2/Intro.h
+++ b/src/openrct2/Intro.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _INTRO_H_
-#define _INTRO_H_
+#pragma once
 
 #include "common.h"
 
@@ -34,5 +33,3 @@ extern IntroState gIntroState;
 
 void intro_update();
 void intro_draw(rct_drawpixelinfo* dpi);
-
-#endif
diff --git a/src/openrct2/interface/Chat.h b/src/openrct2/interface/Chat.h
index d3885109f8..a51cba25a8 100644
--- a/src/openrct2/interface/Chat.h
+++ b/src/openrct2/interface/Chat.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _CHAT_H_
-#define _CHAT_H_
+#pragma once
 
 #include "../common.h"
 
@@ -42,5 +41,3 @@ void chat_history_add(const char* src);
 void chat_input(ChatInput input);
 
 int32_t chat_string_wrapped_get_height(void* args, int32_t width);
-
-#endif
diff --git a/src/openrct2/localisation/Currency.h b/src/openrct2/localisation/Currency.h
index a926f70bf8..9acb00e791 100644
--- a/src/openrct2/localisation/Currency.h
+++ b/src/openrct2/localisation/Currency.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef CURRENCY_H
-#define CURRENCY_H
+#pragma once
 
 #include "../common.h"
 
@@ -68,5 +67,3 @@ extern currency_descriptor CurrencyDescriptors[static_cast<uint8_t>(CurrencyType
  * custom currency entry
  */
 void currency_load_custom_currency_config();
-
-#endif
diff --git a/src/openrct2/paint/tile_element/Paint.Surface.h b/src/openrct2/paint/tile_element/Paint.Surface.h
index 15a7a6793e..2010377992 100644
--- a/src/openrct2/paint/tile_element/Paint.Surface.h
+++ b/src/openrct2/paint/tile_element/Paint.Surface.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _PAINT_SURFACE_H
-#define _PAINT_SURFACE_H
+#pragma once
 
 #include "../../common.h"
 #include "../../sprites.h"
@@ -104,5 +103,3 @@ enum
     SPR_RCT1_WATER_MASK = SPR_CSG_BEGIN + 46787,
     SPR_RCT1_WATER_OVERLAY = SPR_CSG_BEGIN + 46792,
 };
-
-#endif //_PAINT_SURFACE_H
diff --git a/src/openrct2/peep/Peep.h b/src/openrct2/peep/Peep.h
index cf3f035803..6f4bad1206 100644
--- a/src/openrct2/peep/Peep.h
+++ b/src/openrct2/peep/Peep.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _PEEP_H_
-#define _PEEP_H_
+#pragma once
 
 #include "../common.h"
 #include "../management/Finance.h"
@@ -1036,5 +1035,3 @@ inline const rct_sprite_bounds& GetSpriteBounds(
 {
     return g_peep_animation_entries[EnumValue(spriteType)].sprite_bounds[EnumValue(actionSpriteType)];
 };
-
-#endif
diff --git a/src/openrct2/peep/Staff.h b/src/openrct2/peep/Staff.h
index 245af03882..795b9d0fcc 100644
--- a/src/openrct2/peep/Staff.h
+++ b/src/openrct2/peep/Staff.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _STAFF_H_
-#define _STAFF_H_
+#pragma once
 
 #include "../common.h"
 #include "Peep.h"
@@ -75,5 +74,3 @@ int32_t staff_get_available_entertainer_costume_list(EntertainerCostume* costume
 
 money32 GetStaffWage(StaffType type);
 PeepSpriteType EntertainerCostumeToSprite(EntertainerCostume entertainerType);
-
-#endif
diff --git a/src/openrct2/platform/Crash.h b/src/openrct2/platform/Crash.h
index ef1b140122..46c4a1c966 100644
--- a/src/openrct2/platform/Crash.h
+++ b/src/openrct2/platform/Crash.h
@@ -7,12 +7,9 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _OPENRCT2_CRASH_
-#define _OPENRCT2_CRASH_
+#pragma once
 
 using CExceptionHandler = void*;
 
 extern bool gOpenRCT2SilentBreakpad;
 CExceptionHandler crash_init();
-
-#endif /* _OPENRCT2_CRASH_ */
diff --git a/src/openrct2/ride/CableLift.h b/src/openrct2/ride/CableLift.h
index 2c1ec083bd..7660f052af 100644
--- a/src/openrct2/ride/CableLift.h
+++ b/src/openrct2/ride/CableLift.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _CABLE_LIFT_H_
-#define _CABLE_LIFT_H_
+#pragma once
 
 #include "../common.h"
 #include "Ride.h"
@@ -17,5 +16,3 @@ struct Vehicle;
 
 Vehicle* cable_lift_segment_create(
     Ride& ride, int32_t x, int32_t y, int32_t z, int32_t direction, uint16_t var_44, int32_t remaining_distance, bool head);
-
-#endif
diff --git a/src/openrct2/ride/VehicleData.h b/src/openrct2/ride/VehicleData.h
index c4fb7940b6..f78ee882fe 100644
--- a/src/openrct2/ride/VehicleData.h
+++ b/src/openrct2/ride/VehicleData.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _VEHICLE_DATA_H
-#define _VEHICLE_DATA_H
+#pragma once
 
 #include "../common.h"
 
@@ -31,5 +30,3 @@ extern const int32_t dword_9A2930[];
 extern const int32_t dword_9A2970[];
 
 extern const int32_t SpriteDirectionToSoundDirection[];
-
-#endif
diff --git a/src/openrct2/ride/VehiclePaint.h b/src/openrct2/ride/VehiclePaint.h
index 5bbe90dc61..24edb42b9d 100644
--- a/src/openrct2/ride/VehiclePaint.h
+++ b/src/openrct2/ride/VehiclePaint.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _VEHICLE_PAINT_H
-#define _VEHICLE_PAINT_H
+#pragma once
 
 #include "../common.h"
 
@@ -61,5 +60,3 @@ void vehicle_visual_mini_golf_player(
     paint_session* session, int32_t x, int32_t imageDirection, int32_t y, int32_t z, const Vehicle* vehicle);
 void vehicle_visual_mini_golf_ball(
     paint_session* session, int32_t x, int32_t imageDirection, int32_t y, int32_t z, const Vehicle* vehicle);
-
-#endif
diff --git a/src/openrct2/ride/coaster/JuniorRollerCoaster.h b/src/openrct2/ride/coaster/JuniorRollerCoaster.h
index d9bbcaaf66..be1220034e 100644
--- a/src/openrct2/ride/coaster/JuniorRollerCoaster.h
+++ b/src/openrct2/ride/coaster/JuniorRollerCoaster.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _JUNIOR_ROLLER_COASTER_H
-#define _JUNIOR_ROLLER_COASTER_H
+#pragma once
 
 #include "../../common.h"
 
@@ -114,5 +113,3 @@ void junior_rc_paint_track_diag_25_deg_down_to_flat(
 void junior_rc_paint_track_diag_60_deg_down_to_flat(
     paint_session* session, const Ride* ride, uint8_t trackSequence, uint8_t direction, uint16_t height,
     const TrackElement& trackElement, JuniorRcChainType chainType);
-
-#endif // _JUNIOR_ROLLER_COASTER_H
diff --git a/src/openrct2/sprites.h b/src/openrct2/sprites.h
index 87b9c8ee91..991e0ef714 100644
--- a/src/openrct2/sprites.h
+++ b/src/openrct2/sprites.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _SPRITES_H_
-#define _SPRITES_H_
+#pragma once
 
 #include "drawing/ScrollingText.h"
 #include "rct1/RCT1.h"
@@ -1098,5 +1097,3 @@ enum
     SPR_IMAGE_LIST_BEGIN = SPR_SCROLLING_TEXT_END,
     SPR_IMAGE_LIST_END = 0x7FFFE
 };
-
-#endif
diff --git a/src/openrct2/util/SawyerCoding.h b/src/openrct2/util/SawyerCoding.h
index db4a2a1b70..3045ce888e 100644
--- a/src/openrct2/util/SawyerCoding.h
+++ b/src/openrct2/util/SawyerCoding.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _SAWYERCODING_H_
-#define _SAWYERCODING_H_
+#pragma once
 
 #include "../common.h"
 
@@ -55,5 +54,3 @@ int32_t sawyercoding_validate_track_checksum(const uint8_t* src, size_t length);
 
 int32_t sawyercoding_detect_file_type(const uint8_t* src, size_t length);
 int32_t sawyercoding_detect_rct1_version(int32_t gameVersion);
-
-#endif
diff --git a/src/openrct2/world/MapHelpers.h b/src/openrct2/world/MapHelpers.h
index bfcc7af89f..a2097c8a0a 100644
--- a/src/openrct2/world/MapHelpers.h
+++ b/src/openrct2/world/MapHelpers.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _MAP_HELPERS_H_
-#define _MAP_HELPERS_H_
+#pragma once
 
 #include "../common.h"
 
@@ -22,5 +21,3 @@ enum
 
 int32_t map_smooth(int32_t l, int32_t t, int32_t r, int32_t b);
 int32_t tile_smooth(int32_t x, int32_t y);
-
-#endif
diff --git a/src/openrct2/world/Water.h b/src/openrct2/world/Water.h
index ef1af4da04..77943a7c03 100644
--- a/src/openrct2/world/Water.h
+++ b/src/openrct2/world/Water.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _WATER_H_
-#define _WATER_H_
+#pragma once
 
 #include "../common.h"
 
@@ -28,5 +27,3 @@ struct rct_water_type
 };
 assert_struct_size(rct_water_type, 16);
 #pragma pack(pop)
-
-#endif
diff --git a/test/testpaint/Addresses.h b/test/testpaint/Addresses.h
index 6d71cfa890..8db772bf4c 100644
--- a/test/testpaint/Addresses.h
+++ b/test/testpaint/Addresses.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _ADDRESSES_H_
-#define _ADDRESSES_H_
+#pragma once
 
 #include <openrct2/common.h>
 
@@ -41,5 +40,3 @@
  */
 int32_t RCT2_CALLPROC_X(
     int32_t address, int32_t _eax, int32_t _ebx, int32_t _ecx, int32_t _edx, int32_t _esi, int32_t _edi, int32_t _ebp);
-
-#endif
diff --git a/test/testpaint/Data.h b/test/testpaint/Data.h
index cb7feebffe..74717d403d 100644
--- a/test/testpaint/Data.h
+++ b/test/testpaint/Data.h
@@ -7,8 +7,7 @@
  * OpenRCT2 is licensed under the GNU General Public License version 3.
  *****************************************************************************/
 
-#ifndef _TEST_PAINT_DATA_H_
-#define _TEST_PAINT_DATA_H_
+#pragma once
 
 #include <openrct2/common.h>
 #include <openrct2/ride/Ride.h>
@@ -20,5 +19,3 @@ extern const utf8string TrackElemNames[256];
 extern const utf8string RideCodeNames[RCT2_RIDE_TYPE_COUNT];
 extern const utf8string TrackCodeNames[256];
 extern const uint32_t* RideTypeTrackPaintFunctionsOld[RCT2_RIDE_TYPE_COUNT];
-
-#endif // #endif _TEST_PAINT_DATA_H_