diff --git a/src/File.cc b/src/File.cc
index 0be87cf..1f4387d 100644
--- a/src/File.cc
+++ b/src/File.cc
@@ -209,7 +209,7 @@ void File::parse(const std::filesystem::path& filename) {
                         throw Exception("invalid token");
                 }
             } catch (Exception& ex) {
-                std::cerr << tokenizer.file_name() << ":" << tokenizer.current_line_number() << ": " << ex.what() << std::endl;
+                std::cerr << tokenizer.file_name().string() << ":" << tokenizer.current_line_number() << ": " << ex.what() << std::endl;
                 throw Exception();
             }
         }
diff --git a/src/Tokenizer.h b/src/Tokenizer.h
index 6c9e396..ed3dd30 100644
--- a/src/Tokenizer.h
+++ b/src/Tokenizer.h
@@ -101,7 +101,7 @@ class Tokenizer {
     void skip_whitespace();
     void unget(const Token& token);
     [[nodiscard]] int current_line_number() const {return line_number;}
-    [[nodiscard]] const std::string&file_name() const {return filename;}
+    [[nodiscard]] const std::filesystem::path& file_name() const {return filename;}
 
 private:
     static CharacterType type(int c);
@@ -121,7 +121,7 @@ class Tokenizer {
     static std::unordered_map<std::string, TokenType> keywords;
     static std::unordered_map<int, CharacterType> special_characters;
 
-    std::string filename;
+    std::filesystem::path filename;
     std::ifstream source;
     std::optional<Token> ungot;
     bool beggining_of_line = true;