diff --git a/core/detectors/sts/CbmStsParAsic.h b/core/detectors/sts/CbmStsParAsic.h
index 6815acc24132085777dd13fe1a41d7d2b536f2cd..6959814da6bcf455fdfd1e651f3fcb1199d608fd 100644
--- a/core/detectors/sts/CbmStsParAsic.h
+++ b/core/detectors/sts/CbmStsParAsic.h
@@ -180,7 +180,7 @@ public:
   /** @brief Set coefficients for walk correction
    ** @param par Array of correction parameters
    **/
-  void SetWalkCoef(std::array<double, 32> par) { fWalkCoef = par; }
+  void SetWalkCoef(std::array<double, 31> par) { fWalkCoef = par; }
 
   /** @brief Get one of the coefficients for walk correction
    ** @param uIdx Index of the correction parameter
@@ -188,7 +188,7 @@ public:
    **/
   double GetWalkCoef(uint32_t uIdx) const
   {
-    if (uIdx < 32) return fWalkCoef[uIdx];
+    if (uIdx < 31) return fWalkCoef[uIdx];
     return 0.;
   }
 
@@ -206,9 +206,7 @@ private:
   double fNoise                   = 0.;                  ///< RMS of noise [e]
   double fZeroNoiseRate           = 0.;                  ///< Zero-crossing noise rate [1/ns]
   double fTimeOffset              = 0.;                  ///< Time offset [ns]
-  std::array<double, 32> fWalkCoef = {{0., 0., 0., 0.,    ///< Parameters for correction of walk effect
-                                       0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
-                                       0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.}};
+  std::array<double, 31> fWalkCoef = {};                 ///< Parameters for correction of walk effect
   std::set<uint16_t> fDeadChannels {};                   ///< Map of dead channels
 
   bool fIsInit = kFALSE;  //! Flag for being initialised
diff --git a/macro/run/run_unpack_tsa.C b/macro/run/run_unpack_tsa.C
index a7419c6d6973a8c5a32b5429e737a3443522b79c..4c0717ec4459ce75067653ca22bd720aea6f49b5 100644
--- a/macro/run/run_unpack_tsa.C
+++ b/macro/run/run_unpack_tsa.C
@@ -185,9 +185,7 @@ void run_unpack_tsa(std::vector<std::string> infile = {"test.tsa"}, UInt_t runid
     auto parAsic = new CbmStsParAsic(128, 31, 31., 1., 5., 800., 1000., 3.9789e-3);  // Default ASIC parameters
     auto parMod  = new CbmStsParModule(2048, 128);  // Generic STS module parameter object
 
-    std::array<double, 32> tw_map = {{0., 0., 0., 0.,  // Default time walk map
-                                      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
-                                      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.}};
+    std::array<double, 31> tw_map = {}; // Default time walk map
     parAsic->SetWalkCoef(tw_map);   // Set generic ASIC par with no time walk correction
     parMod->SetAllAsics(*parAsic);  // Set generic module ASIC as default ASIC parameter configuration
 
@@ -198,7 +196,7 @@ void run_unpack_tsa(std::vector<std::string> infile = {"test.tsa"}, UInt_t runid
     int sensor, asic;
     std::ifstream asicTimeWalk_par(Form("%s/mStsAsicTimeWalk.par", parfilesbasepathSts.data()));
     while (asicTimeWalk_par >> std::hex >> sensor >> std::dec >> asic) {  // Read module and ASIC
-      LOG(info) << Form("[STS] Reading %x %u", sensor, asic);
+      LOG(debug) << Form("[STS] Reading %x %u", sensor, asic);
       for (int adc = 0; adc < 31; adc++) {  // Read time offset by ADC
         asicTimeWalk_par >> tw_map[adc];    // Set time walk map offset value for given ADC
         if (std::fabs(tw_map[adc]) > 100) {
@@ -213,7 +211,7 @@ void run_unpack_tsa(std::vector<std::string> infile = {"test.tsa"}, UInt_t runid
       }
       moduleWalkMap[sensor].SetAsic(asic, *parAsic);  // Set ASIC parameter
 
-      LOG(info) << Form("\n[STS] Time Walk parameters loaded for: module %x, ASIC %u\n", sensor, asic);
+      LOG(debug) << Form("\n[STS] Time Walk parameters loaded for: module %x, ASIC %u\n", sensor, asic);
     }
 
     stsconfig->SetWalkMap(moduleWalkMap);
diff --git a/reco/detectors/sts/unpack/CbmStsUnpackAlgoBase.cxx b/reco/detectors/sts/unpack/CbmStsUnpackAlgoBase.cxx
index 378a82c9444f14879f4504bd8bde7a62aa1ed1a1..8c6dba7d467363fe08bf04718b2be9cfce59ce9c 100644
--- a/reco/detectors/sts/unpack/CbmStsUnpackAlgoBase.cxx
+++ b/reco/detectors/sts/unpack/CbmStsUnpackAlgoBase.cxx
@@ -31,8 +31,8 @@ void CbmStsUnpackAlgoBase::SetWalkMap(const std::map<uint32_t, CbmStsParModule>&
     fWalkLookup[mapInEntry.first].resize(uNbAsics);
     LOG(debug) << Form("[STS-UNPACKER] setting TW parameters: %x\n", mapInEntry.first);
     for (uint32_t asicIdx = 0; asicIdx < uNbAsics; ++asicIdx) {
-      fWalkLookup[mapInEntry.first][asicIdx].resize(32);
-      for (uint32_t uAdc = 0; uAdc < 32; ++uAdc) {
+      fWalkLookup[mapInEntry.first][asicIdx].resize(31);
+      for (uint32_t uAdc = 0; uAdc < 31; ++uAdc) {
         fWalkLookup[mapInEntry.first][asicIdx][uAdc] = asicPars[asicIdx].GetWalkCoef(uAdc);
       }
     }