diff --git a/amm_sdk/src/storage/midi.rs b/amm_sdk/src/storage/midi.rs
index fe2d530..814cf24 100644
--- a/amm_sdk/src/storage/midi.rs
+++ b/amm_sdk/src/storage/midi.rs
@@ -151,7 +151,7 @@ impl MidiInstrument {
     if midi_number > 127 {
       Self::GrandPiano
     } else {
-      unsafe { core::mem::transmute(midi_number) }
+      unsafe { core::mem::transmute::<u8, MidiInstrument>(midi_number) }
     }
   }
 }