diff --git a/src/gausskernel/storage/cstore/cstore_delete.cpp b/src/gausskernel/storage/cstore/cstore_delete.cpp
index fc704c493bec72d12ce067b9b485cd0a52fdc461..b0e2461382cfa2bde4a96d948f5cb0b0bc4082c3 100644
--- a/src/gausskernel/storage/cstore/cstore_delete.cpp
+++ b/src/gausskernel/storage/cstore/cstore_delete.cpp
@@ -819,6 +819,7 @@ Retry:
         newTup =
             CStore::FormVCCUDescTup(cudesc_tupdesc, (char*)delMask, cuid, rowCount, GetCurrentTransactionIdIfAny());
         oldTupCtid = oldTup->t_self;
+        pfree(delMask);
     };
 
     systable_endscan_ordered(cudesc_scan);