diff --git a/src/compress.hh b/src/compress.hh
index ff1cb26..58bce87 100644
--- a/src/compress.hh
+++ b/src/compress.hh
@@ -10,15 +10,10 @@
 #include <vector>
 #include <iostream>
 #include <thread>
-#include <optional>
 
 /// \brief Compression d'une chaine de caractères
 std::vector<std::vector<std::uint32_t>> lzw_compress(std::string &&);
 
-std::optional<std::uint32_t>
-lzw_compress_char(std::vector<std::vector<std::uint32_t>> &,
-                  std::vector<std::uint32_t> &, const char);
-
 /// \brief Wrapper de \ref lzw_compress
 void compress(const std::string &, const char *);