diff --git a/src/physics/time/time.hpp b/src/physics/time/time.hpp
index 8f96d7e..ec2f6ca 100644
--- a/src/physics/time/time.hpp
+++ b/src/physics/time/time.hpp
@@ -25,8 +25,8 @@ namespace physics {
 /// Time-related functions.
 namespace time {}
 
-#include "ut1.hpp"
-
 } // namespace physics
 
+#include "ut1.hpp"
+
 #endif // ANTKEEPER_PHYSICS_TIME_HPP