diff --git a/base/allocator/partition_allocator/pcscan.cc b/base/allocator/partition_allocator/pcscan.cc
index 5cc93dbbd..69aaa0934 100644
--- a/base/allocator/partition_allocator/pcscan.cc
+++ b/base/allocator/partition_allocator/pcscan.cc
@@ -41,7 +41,7 @@ ThreadSafePartitionRoot& PCScanMetadataAllocator() {
 // STL allocator which is needed to keep internal data structures required by
 // PCScan.
 template <typename T>
-class MetadataAllocator final {
+class MetadataAllocator {
  public:
   using value_type = T;