diff --git a/Digitisers/SimpleDigi/src/TPCDigiAlg.h b/Digitisers/SimpleDigi/src/TPCDigiAlg.h
index af0f6391f7ee9f5c4e2386221e8aa6f8dbde7151..c1c6eabd6c30335ac11c9d067d1f5bcdd56fa383 100644
--- a/Digitisers/SimpleDigi/src/TPCDigiAlg.h
+++ b/Digitisers/SimpleDigi/src/TPCDigiAlg.h
@@ -210,7 +210,7 @@ protected:
   int _nRechits;
 
   std::vector< std::vector <Voxel_tpc *> > _tpcRowHits;
-  std::map< Voxel_tpc *,edm4hep::SimTrackerHit > _tpcHitMap;
+  // std::map< Voxel_tpc *,edm4hep::SimTrackerHit > _tpcHitMap;
 
   UTIL::BitField64* _cellid_encoder;