From 12d3022fac9bd80397166917d01848541b4e216d Mon Sep 17 00:00:00 2001
From: Daniel Kral <daniel.kral@recombee.com>
Date: Wed, 6 May 2026 20:34:30 +0200
Subject: [PATCH] Add fix

The same fix as in https://github.com/boostorg/multi_index/pull/94/changes
---
 include/boost/unordered/detail/implementation.hpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/boost/unordered/detail/implementation.hpp b/include/boost/unordered/detail/implementation.hpp
index 214243b1d1..595ec2693c 100644
--- a/include/boost/unordered/detail/implementation.hpp
+++ b/include/boost/unordered/detail/implementation.hpp
@@ -2712,8 +2712,9 @@ namespace boost {
       inline void table<Types>::reserve_for_insert(std::size_t num_elements)
       {
         if (num_elements > max_load_) {
-          std::size_t const num_buckets = static_cast<std::size_t>(
-            1.0f + std::ceil(static_cast<float>(num_elements) / mlf_));
+          std::size_t const num_buckets = (std::max)(
+            static_cast<std::size_t>(1.0f + std::ceil(static_cast<float>(num_elements) / mlf_)),
+            static_cast<std::size_t>(bucket_count() + 1));
 
           this->rehash_impl(num_buckets);
         }