diff --git a/negromate/songs/loader.py b/negromate/songs/loader.py
index 57659df..a36c872 100644
--- a/negromate/songs/loader.py
+++ b/negromate/songs/loader.py
@@ -92,7 +92,7 @@ class Song:
                 srtfile.write(asstosrt.convert(assfile))
             self.files.append(self.srt)
 
-        vtt = self.path / "{self.path.name}.vtt"
+        vtt = self.path / f"{self.path.name}.vtt"
         if regenerate or needs_change(vtt, (self.srt,)):
             logger.info("generating %s", str(vtt))
             self.vtt = vtt