diff --git a/examples/physics.cpp b/examples/physics.cpp
index 82d9baf2..855fcc96 100644
--- a/examples/physics.cpp
+++ b/examples/physics.cpp
@@ -10,6 +10,7 @@
 #include <psemek/geom/rotation.hpp>
 #include <psemek/geom/camera.hpp>
 #include <psemek/geom/math.hpp>
+#include <psemek/geom/distance.hpp>
 
 #include <psemek/util/clock.hpp>
 #include <psemek/util/unused.hpp>