diff --git a/src/world/map.c b/src/world/map.c
index 2721e1c6b2..764e549686 100644
--- a/src/world/map.c
+++ b/src/world/map.c
@@ -326,7 +326,7 @@ void map_init(int size)
 		map_element_set_terrain_edge(map_element, TERRAIN_EDGE_ROCK);
 	}
 
-	RCT2_GLOBAL(RCT2_ADDRESS_GRASS_SCENERY_TILEPOS, sint16) = 0;
+	gGrassSceneryTileLoopPosition = 0;
 	gWidePathTileLoopX = 0;
 	gWidePathTileLoopY = 0;
 	gMapSizeUnits = size * 32 - 32;
@@ -4232,7 +4232,7 @@ void map_update_tiles()
 		int x = 0;
 		int y = 0;
 
-		uint16 interleaved_xy = RCT2_GLOBAL(RCT2_ADDRESS_GRASS_SCENERY_TILEPOS, sint16);
+		uint16 interleaved_xy = gGrassSceneryTileLoopPosition;
 		for (int i = 0; i < 8; i++) {
 			x = (x << 1) | (interleaved_xy & 1);
 			interleaved_xy >>= 1;
@@ -4246,8 +4246,8 @@ void map_update_tiles()
 			scenery_update_tile(x * 32, y * 32);
 		}
 
-		RCT2_GLOBAL(RCT2_ADDRESS_GRASS_SCENERY_TILEPOS, sint16)++;
-		RCT2_GLOBAL(RCT2_ADDRESS_GRASS_SCENERY_TILEPOS, sint16) &= 0xFFFF;
+		gGrassSceneryTileLoopPosition++;
+		gGrassSceneryTileLoopPosition &= 0xFFFF;
 	}
 }
 
diff --git a/src/world/map.h b/src/world/map.h
index 81388267ce..c865c26389 100644
--- a/src/world/map.h
+++ b/src/world/map.h
@@ -267,8 +267,9 @@ typedef struct {
 
 extern const rct_xy16 TileDirectionDelta[];
 
-#define gWidePathTileLoopX	RCT2_GLOBAL(0x013CE774, uint16)
-#define gWidePathTileLoopY	RCT2_GLOBAL(0x013CE776, uint16)
+#define gWidePathTileLoopX				RCT2_GLOBAL(0x013CE774, uint16)
+#define gWidePathTileLoopY				RCT2_GLOBAL(0x013CE776, uint16)
+#define gGrassSceneryTileLoopPosition	RCT2_GLOBAL(RCT2_ADDRESS_GRASS_SCENERY_TILEPOS, uint16)
 
 #define gMapSizeUnits		RCT2_GLOBAL(RCT2_ADDRESS_MAP_SIZE_UNITS, sint16)
 #define gMapSizeMinus2		RCT2_GLOBAL(RCT2_ADDRESS_MAP_SIZE_MINUS_2, sint16)