diff --git a/src/music_storage/db_reader/extern_library.rs b/src/music_storage/db_reader/extern_library.rs
index ffe0711..047fcc6 100644
--- a/src/music_storage/db_reader/extern_library.rs
+++ b/src/music_storage/db_reader/extern_library.rs
@@ -2,8 +2,8 @@ use std::path::PathBuf;
 
 
 pub trait ExternalLibrary {
-    fn from_file(&mut self, file: &PathBuf) -> Self;
+    fn from_file(file: &PathBuf) -> Self;
     fn write(&self) {
         unimplemented!();
     }
-}
\ No newline at end of file
+}