diff --git a/src/interface/window.c b/src/interface/window.c
index 90865813d7..8a4ad7831a 100644
--- a/src/interface/window.c
+++ b/src/interface/window.c
@@ -1389,7 +1389,7 @@ void window_rotate_camera(rct_window *w, int direction)
 		z = map_element_height(x, y);
 	}
 
-	RCT2_GLOBAL(RCT2_ADDRESS_CURRENT_ROTATION, uint32) = (get_current_rotation() + direction) % 4;
+	RCT2_GLOBAL(RCT2_ADDRESS_CURRENT_ROTATION, uint32) = (get_current_rotation() + direction) & 3;
 
 	int new_x, new_y;
 	center_2d_coordinates(x, y, z, &new_x, &new_y, viewport);