--- a/base/allocator/partition_allocator/src/partition_alloc/partition_bucket.cc
+++ b/base/allocator/partition_allocator/src/partition_alloc/partition_bucket.cc
@@ -506,6 +506,9 @@
        partition_page_count <= kMaxPartitionPagesPerRegularSlotSpan;
        partition_page_count++) {
     size_t candidate_size = partition_page_count * PartitionPageSize();
+    if (candidate_size > kMaxBucketed) {
+      break;
+    }
     size_t waste = candidate_size % slot_size;
     if (waste <= .02 * SystemPageSize()) {
       return partition_page_count * NumSystemPagesPerPartitionPage();
@@ -522,6 +525,9 @@
       size_t system_page_count =
           partition_page_count * NumSystemPagesPerPartitionPage() - slack;
       size_t candidate_size = system_page_count * SystemPageSize();
+      if (candidate_size > kMaxBucketed) {
+        break;
+      }
       size_t waste = candidate_size % slot_size;
       if (waste < best_waste) {
         best_waste = waste;