diff --git a/Detectors/ZDC/calib/include/ZDCCalib/InterCalib.h b/Detectors/ZDC/calib/include/ZDCCalib/InterCalib.h
index 1ebe5d6edc1ca..9b49e2f29d4bb 100644
--- a/Detectors/ZDC/calib/include/ZDCCalib/InterCalib.h
+++ b/Detectors/ZDC/calib/include/ZDCCalib/InterCalib.h
@@ -52,8 +52,8 @@ class InterCalib
   int process(const char* hname, int ic);             // Calibration of RUN2 data
   void replay(int ih, THnSparse* hs, int ic);         // Test of calibration using RUN2 data
   int mini(int ih);
-  void add(std::array<o2::dataformats::FlatHisto1D<float>*, 2 * InterCalibData::NH> &h1);
-  void add(std::array<o2::dataformats::FlatHisto2D<float>*, InterCalibData::NH> &h2);
+  void add(std::array<o2::dataformats::FlatHisto1D<float>*, 2 * InterCalibData::NH>& h1);
+  void add(std::array<o2::dataformats::FlatHisto2D<float>*, InterCalibData::NH>& h2);
   int write(const std::string fn = "ZDCInterCalib.root");
 
   static double mAdd[NPAR][NPAR]; /// Temporary copy of cumulated sums
diff --git a/Detectors/ZDC/calib/src/InterCalib.cxx b/Detectors/ZDC/calib/src/InterCalib.cxx
index 71add2882f060..efb5c628d8f00 100644
--- a/Detectors/ZDC/calib/src/InterCalib.cxx
+++ b/Detectors/ZDC/calib/src/InterCalib.cxx
@@ -326,23 +326,25 @@ int InterCalib::process(const InterCalibData& data)
   return 0;
 }
 
-void InterCalib::add(std::array<o2::dataformats::FlatHisto1D<float>*, 2 * InterCalibData::NH> &h1){
+void InterCalib::add(std::array<o2::dataformats::FlatHisto1D<float>*, 2 * InterCalibData::NH>& h1)
+{
   if (!mInitDone) {
     init();
   }
   int nh = 2 * InterCalibData::NH;
-  for(int ih = 0; ih < nh; ih++){
+  for (int ih = 0; ih < nh; ih++) {
     auto h = *(h1[ih]);
     LOG(info) << "adding H1(" << h.getNBins() << "," << h.getXMin() << "," << h.getXMax() << ")";
     mHUnc[ih]->add(h);
   }
 }
 
-void InterCalib::add(std::array<o2::dataformats::FlatHisto2D<float>*, InterCalibData::NH> &h2){
+void InterCalib::add(std::array<o2::dataformats::FlatHisto2D<float>*, InterCalibData::NH>& h2)
+{
   if (!mInitDone) {
     init();
   }
-  for(int ih = 0; ih < InterCalibData::NH; ih++){
+  for (int ih = 0; ih < InterCalibData::NH; ih++) {
     mCUnc[ih]->add(*(h2[ih]));
   }
 }