diff --git a/src/backup/key_derivation.rs b/src/backup/key_derivation.rs
index 40f7e0ae..abe314b9 100644
--- a/src/backup/key_derivation.rs
+++ b/src/backup/key_derivation.rs
@@ -148,7 +148,7 @@ pub fn encrypt_key_with_passphrase(
     })
 }
 
-pub fn load_and_decrtypt_key(path: &std::path::Path, passphrase: fn() -> Result<Vec<u8>, Error>) -> Result<([u8;32], DateTime<Local>), Error> {
+pub fn load_and_decrtypt_key(path: &std::path::Path, passphrase: &dyn Fn() -> Result<Vec<u8>, Error>) -> Result<([u8;32], DateTime<Local>), Error> {
 
     let raw = file_get_contents(&path)?;
     let data = String::from_utf8(raw)?;