diff --git a/DEPS b/DEPS
index bfefaaa..16e183a 100644
--- a/DEPS
+++ b/DEPS
@@ -144,7 +144,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling partition_allocator
   # and whatever else without interference from each other.
-  'partition_allocator_revision': 'f13adc396ddb3ca92ef29402c78eef2011567f76',
+  'partition_allocator_revision': 'ad18d83b72c7a6cef9baa6a6ac01340765fb7964',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling pdfium_tests
   # and whatever else without interference from each other.
diff --git a/build_overrides/partition_alloc.gni b/build_overrides/partition_alloc.gni
index 0cf7009..dec488b 100644
--- a/build_overrides/partition_alloc.gni
+++ b/build_overrides/partition_alloc.gni
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 # See base/allocator/partition_allocator/external_builds.md
+use_allocator_shim_default = false
 use_partition_alloc_as_malloc_default = false
 enable_mte_checked_ptr_support_default = false
 enable_backup_ref_ptr_support_default = false