diff --git a/Modules/TPC/src/CheckOfSlices.cxx b/Modules/TPC/src/CheckOfSlices.cxx
index aa16abb01e..3ee26906f0 100644
--- a/Modules/TPC/src/CheckOfSlices.cxx
+++ b/Modules/TPC/src/CheckOfSlices.cxx
@@ -509,15 +509,15 @@ std::string CheckOfSlices::createMetaData(const std::vector<std::string>& pointM
   std::string expectedValueString = "";
   std::string rangeString = "";
 
-  for (int i; i < pointMetaData.size(); i++) {
+  for (int i = 0; i < pointMetaData.size(); i++) {
     if (pointMetaData.at(i).find("MeanCheck") != std::string::npos) {
-      meanString += " " + std::to_string(i + 1) + ",";
+      meanString += " " + std::to_string(i) + ",";
     }
     if (pointMetaData.at(i).find("ExpectedValueCheck") != std::string::npos) {
-      expectedValueString += " " + std::to_string(i + 1) + ",";
+      expectedValueString += " " + std::to_string(i) + ",";
     }
     if (pointMetaData.at(i).find("RangeCheck") != std::string::npos) {
-      rangeString += " " + std::to_string(i + 1) + ",";
+      rangeString += " " + std::to_string(i) + ",";
     }
   }
 
@@ -541,4 +541,4 @@ std::string CheckOfSlices::createMetaData(const std::vector<std::string>& pointM
   return totalString;
 }
 
-} // namespace o2::quality_control_modules::tpc
\ No newline at end of file
+} // namespace o2::quality_control_modules::tpc