diff --git a/DataFormats/Detectors/ITSMFT/common/src/CTF.cxx b/DataFormats/Detectors/ITSMFT/common/src/CTF.cxx
index 4d4ea358b29b5..ca27e08bf31fe 100644
--- a/DataFormats/Detectors/ITSMFT/common/src/CTF.cxx
+++ b/DataFormats/Detectors/ITSMFT/common/src/CTF.cxx
@@ -27,6 +27,7 @@ void CompressedClusters::clear()
   row.clear();
   colInc.clear();
   chipInc.clear();
+  chipMul.clear();
   pattID.clear();
   pattMap.clear();
 }