diff --git a/examples/physics_examples/synchrotron_test_manual_tracking.cpp b/examples/physics_examples/synchrotron_test_manual_tracking.cpp
index 4b43e8e71d2459b31ad96c7a61b4f0dbaed62a0e..e8b55d3095e856cdf439d6e1319f0f4f6e7e8f0b 100644
--- a/examples/physics_examples/synchrotron_test_manual_tracking.cpp
+++ b/examples/physics_examples/synchrotron_test_manual_tracking.cpp
@@ -27,7 +27,7 @@
 #include <corsika/modules/radio/RadioProcess.hpp>
 #include <corsika/modules/radio/CoREAS.hpp>
 #include <corsika/modules/radio/ZHS.hpp>
-#include <corsika/modules/radio/observer/TimeDomainObserver.hpp>
+#include <corsika/modules/radio/observers/TimeDomainObserver.hpp>
 #include <corsika/modules/radio/detectors/ObserverCollection.hpp>
 #include <corsika/modules/radio/propagators/DummyTestPropagator.hpp>