diff --git a/otherarch/acestep/bpe.h b/otherarch/acestep/bpe.h
index fe5ebc6d1..6da28c0f8 100644
--- a/otherarch/acestep/bpe.h
+++ b/otherarch/acestep/bpe.h
@@ -263,6 +263,8 @@ static std::vector<std::string> gpt2_pre_tokenize(const std::string &text) {
     return chunks;
 }
 
+namespace kcpp_workaround_multiple_BPETokenizer {
+
 // BPE tokenizer struct
 struct BPETokenizer {
     std::unordered_map<std::string, int> vocab;  // token_str -> id
@@ -273,6 +275,9 @@ struct BPETokenizer {
     std::vector<std::string> id_to_str;          // id -> token_str (reverse vocab)
 };
 
+}
+using kcpp_workaround_multiple_BPETokenizer::BPETokenizer;
+
 // Minimal JSON parser for vocab.json ({"str": int, ...})
 static bool load_vocab_json(const std::string &path, std::unordered_map<std::string, int> &vocab) {
     FILE *f = fopen(path.c_str(), "rb");