diff --git a/algo/detectors/trd2d/ReadoutConfig.cxx b/algo/detectors/trd2d/ReadoutConfig.cxx
index 7d3dc97ef78c991aa2049beb83a5deb1373ccf34..faeb1cb9cccdc9d2b8993549a60f0a9ee985db33 100644
--- a/algo/detectors/trd2d/ReadoutConfig.cxx
+++ b/algo/detectors/trd2d/ReadoutConfig.cxx
@@ -119,8 +119,7 @@ namespace cbm::algo::trd2d
 
   // ---  Initialise the mapping structure   --------------------------------------------
   void ReadoutSetup::InitChannelMap(
-    const std::map<size_t, std::map<size_t, std::map<size_t, std::tuple<int32_t, bool, uint8_t, uint16_t>>>>&
-      channelMap)
+    const std::map<size_t, std::map<size_t, std::map<size_t, std::tuple<int32_t, bool, int8_t, uint16_t>>>>& channelMap)
   {
     // Constructing the map (equipId, asicId, chanId) -> (pad address, mask flag, daq offset)
     for (auto compMap : channelMap) {
@@ -132,7 +131,7 @@ namespace cbm::algo::trd2d
         fChannelMap[equipmentId][asicId].resize(16);
         for (auto chanMap : asicMap.second) {
           uint16_t chanId                              = chanMap.first;
-          std::tuple<int32_t, bool, uint8_t, uint16_t> chanPars = chanMap.second;
+          std::tuple<int32_t, bool, int8_t, uint16_t> chanPars = chanMap.second;
           const ChanMapping entry = {std::get<0>(chanPars), std::get<1>(chanPars), std::get<2>(chanPars),
                                      std::get<3>(chanPars)};
           fChannelMap[equipmentId][asicId][chanId] = entry;
diff --git a/algo/detectors/trd2d/ReadoutConfig.h b/algo/detectors/trd2d/ReadoutConfig.h
index 473a662f94105f5f24be5a90dd376fdcbad7e3ef..fe590915be7554e24d0ff223e08b3a7e1aa3483f 100644
--- a/algo/detectors/trd2d/ReadoutConfig.h
+++ b/algo/detectors/trd2d/ReadoutConfig.h
@@ -116,7 +116,7 @@ namespace cbm::algo::trd2d
 
     /** @brief Initialisation of channel map **/
     void InitChannelMap(
-      const std::map<size_t, std::map<size_t, std::map<size_t, std::tuple<int32_t, bool, uint8_t, uint16_t>>>>&
+      const std::map<size_t, std::map<size_t, std::map<size_t, std::tuple<int32_t, bool, int8_t, uint16_t>>>>&
         channelMap);
 
     /** @brief Get system time offset **/
diff --git a/reco/tasks/CbmTaskTrdUnpackParWrite.cxx b/reco/tasks/CbmTaskTrdUnpackParWrite.cxx
index 078d7f32bf656d541598ed3cee0db5da577cfb6b..92e14baf53ac9549651669391b09bb7c27fb6f43 100644
--- a/reco/tasks/CbmTaskTrdUnpackParWrite.cxx
+++ b/reco/tasks/CbmTaskTrdUnpackParWrite.cxx
@@ -39,7 +39,7 @@ InitStatus CbmTaskTrdUnpackParWrite::Init()
     // Map (moduleId) -> (array of crobId)
     std::map<uint32_t, std::vector<uint16_t>> crobMap;
     // Map (equipId, asicId, chanId) -> (pad address, mask flag, daq offset [FASP clk])
-    std::map<size_t, std::map<size_t, std::map<size_t, std::tuple<int32_t, bool, uint8_t, uint16_t>>>> channelMap;
+    std::map<size_t, std::map<size_t, std::map<size_t, std::tuple<int32_t, bool, int8_t, uint16_t>>>> channelMap;
 
     // Loop through a list of module IDs from the .digi file (can in principle contradict crob_map).
     for (auto entry : digiparset.GetModuleMap()) {