diff --git a/Detectors/EMCAL/workflow/include/EMCALWorkflow/EMCALDigitizerSpec.h b/Detectors/EMCAL/workflow/include/EMCALWorkflow/EMCALDigitizerSpec.h
index ca30bee08ea73..880d047c6af48 100644
--- a/Detectors/EMCAL/workflow/include/EMCALWorkflow/EMCALDigitizerSpec.h
+++ b/Detectors/EMCAL/workflow/include/EMCALWorkflow/EMCALDigitizerSpec.h
@@ -89,9 +89,9 @@ class DigitizerSpec final : public o2::base::BaseDPLDigitizer, public o2::framew
   std::shared_ptr<CalibLoader> mCalibHandler; ///< Handler of calibration objects
   std::vector<Hit> mHits;                     ///< Vector with input hits
   std::vector<TChain*> mSimChains;
-  o2::ctp::CTPConfiguration* mCTPConfig; ///< CTP configuration
-  o2::detectors::DetID::mask_t mDetMask; ///< to keep track whether FT0 and FV0 are included
-  o2::steer::MCKinematicsReader* mcReader; ///< reader to access MC collision information
+  o2::ctp::CTPConfiguration* mCTPConfig = nullptr;   ///< CTP configuration
+  o2::detectors::DetID::mask_t mDetMask;             ///< to keep track whether FT0 and FV0 are included
+  o2::steer::MCKinematicsReader* mcReader = nullptr; ///< reader to access MC collision information
 
   DigitizerTRU mDigitizerTRU;             ///< Digitizer object TRU
   o2::emcal::SDigitizer mSumDigitizerTRU; ///< Summed digitizer TRU