diff --git a/um_crypto/ncm/src/header.rs b/um_crypto/ncm/src/header.rs
index 6c9493a..b4edb70 100644
--- a/um_crypto/ncm/src/header.rs
+++ b/um_crypto/ncm/src/header.rs
@@ -218,7 +218,7 @@ fn test_load_ncm() -> Result<(), Error> {
     assert_eq!(ncm.image2, Some(b"IMAGE#2".to_vec()));
 
     let mut audio_data = ncm_header[ncm.audio_data_offset..].to_vec();
-    ncm.decrypt(&mut audio_data, 0)?;
+    ncm.decrypt(&mut audio_data, 0);
     let actual = vec![
         0x49, 0x44, 0x33, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01, 0x73, 0x54, 0x50, 0x45, 0x31, 0x00,
     ];