diff --git a/include/crpropa/module/Observer.h b/include/crpropa/module/Observer.h
index 42234998e..529aa62ee 100644
--- a/include/crpropa/module/Observer.h
+++ b/include/crpropa/module/Observer.h
@@ -282,16 +282,6 @@ class ObserverTimeEvolution: public ObserverFeature {
 	std::string getDescription() const;
 };
 
-class ObserverTrajectoryLength: public ObserverFeature {
-private: 
-	double maxLength; 
-public: 
-	ObserverTrajectoryLength(double l);
-
-	DetectionState checkDetection(Candidate *candidate) const;
-};
-
-
 /** @} */
 
 }
diff --git a/src/module/Observer.cpp b/src/module/Observer.cpp
index 3b464ed15..5f1b3a2d5 100644
--- a/src/module/Observer.cpp
+++ b/src/module/Observer.cpp
@@ -365,17 +365,5 @@ std::string ObserverSurface::getDescription() const {
 	return ss.str();
 }
 
-// ObserverTrajectoryLength ---------------------------------------------------
 
-ObserverTrajectoryLength::ObserverTrajectoryLength(double l) : maxLength(l) { }
-
-DetectionState ObserverTrajectoryLength::checkDetection(Candidate *cand) const {
-	double currentLength = cand -> getTrajectoryLength(); 
-
-	if (currentLength > maxLength) 
-		return DETECTED;
-	
-	cand -> limitNextStep(maxLength - currentLength); 
-	return NOTHING;
-}
 } // namespace crpropa