diff --git a/core/detectors/trd/CbmTrdRadiator.cxx b/core/detectors/trd/CbmTrdRadiator.cxx
index 43e2a654087a9ddc74f7a2503b534a6cc55f0583..c8a59bd1d686f011f8e7e69518df8a792c4a6c34 100644
--- a/core/detectors/trd/CbmTrdRadiator.cxx
+++ b/core/detectors/trd/CbmTrdRadiator.cxx
@@ -14,6 +14,7 @@
 #include <TH1.h>          // for TH1D
 #include <TMath.h>        // for Exp, Sqrt, Cos, Pi
 #include <TMathBase.h>    // for Abs
+#include <TObjString.h>   // for TObjString
 #include <TRandom.h>      // for TRandom
 #include <TRandom3.h>     // for gRandom
 #include <TVector3.h>     // for TVector3