diff --git a/source/RobotAPI/libraries/ArmarXObjects/Scene.h b/source/RobotAPI/libraries/ArmarXObjects/Scene.h
index 635ff62897e54f669f3c01ca3879666332f6a0a8..3c2767c017ce2ac19faef9bde78b7ede5bba8b13 100644
--- a/source/RobotAPI/libraries/ArmarXObjects/Scene.h
+++ b/source/RobotAPI/libraries/ArmarXObjects/Scene.h
@@ -24,6 +24,7 @@
 #include <map>
 #include <string>
 #include <vector>
+#include <optional>
 
 #include <Eigen/Core>
 #include <Eigen/Geometry>