diff --git a/src/openrct2/world/Location.hpp b/src/openrct2/world/Location.hpp
index ea87892ee1..59b1e1cf57 100644
--- a/src/openrct2/world/Location.hpp
+++ b/src/openrct2/world/Location.hpp
@@ -144,7 +144,7 @@ typedef uint8_t Direction;
  * Given a direction, return the direction that points the other way,
  * on the same axis.
  */
-inline Direction direction_reverse(const Direction& dir)
+constexpr Direction direction_reverse(Direction dir)
 {
     return dir ^ 2;
 }