diff --git a/ydb/library/yql/minikql/mkql_alloc.cpp b/ydb/library/yql/minikql/mkql_alloc.cpp
index 2ee6034cb965..fc2ae88240f8 100644
--- a/ydb/library/yql/minikql/mkql_alloc.cpp
+++ b/ydb/library/yql/minikql/mkql_alloc.cpp
@@ -37,7 +37,8 @@ void TAllocState::CleanupPAllocList(TListEntry* root) {
     for (auto curr = root->Right; curr != root; ) {
         auto next = curr->Right;
         auto size = ((TMkqlPAllocHeader*)curr)->Size;
-        MKQLFreeWithSize(curr, size, EMemorySubPool::Default); // may free items from OffloadedBlocksRoot
+	auto fullSize = size + sizeof(TMkqlPAllocHeader);
+        MKQLFreeWithSize(curr, fullSize, EMemorySubPool::Default); // may free items from OffloadedBlocksRoot
         curr = next;
     }
 
diff --git a/ydb/library/yql/parser/pg_wrapper/comp_factory.cpp b/ydb/library/yql/parser/pg_wrapper/comp_factory.cpp
index 4dd8d5e7e415..930a9ed9e76a 100644
--- a/ydb/library/yql/parser/pg_wrapper/comp_factory.cpp
+++ b/ydb/library/yql/parser/pg_wrapper/comp_factory.cpp
@@ -127,7 +127,8 @@ void MkqlAllocSetFree(MemoryContext context, void* pointer) {
         auto header = ((TMkqlPAllocHeader*)pointer) - 1;
         // remove this block from list
         header->U.Entry.Unlink();
-        MKQLFreeWithSize(header, header->Size, EMemorySubPool::Default);
+        auto fullSize = header->Size + sizeof(TMkqlPAllocHeader);
+        MKQLFreeWithSize(header, fullSize, EMemorySubPool::Default);
     }
 }