diff --git a/CHANGELOG.md b/CHANGELOG.md
index 12231fe4..7c8de908 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,7 +12,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 ### Changed
 
 ### Fixed
-
+- `add_bool` now appends data through `buffer_customization<TBuffer>::push_back`.
 
 ## [1.8.1] - 2025-07-15
 
diff --git a/include/protozero/basic_pbf_writer.hpp b/include/protozero/basic_pbf_writer.hpp
index c26ba67c..cc0f7cd5 100644
--- a/include/protozero/basic_pbf_writer.hpp
+++ b/include/protozero/basic_pbf_writer.hpp
@@ -391,7 +391,7 @@ class basic_pbf_writer {
         add_field(tag, pbf_wire_type::varint);
         protozero_assert(m_pos == 0 && "you can't add fields to a parent basic_pbf_writer if there is an existing basic_pbf_writer for a submessage");
         protozero_assert(m_data);
-        m_data->push_back(static_cast<char>(value));
+        buffer_customization<TBuffer>::push_back(m_data, static_cast<char>(value));
     }
 
     /**