diff --git a/src/ed25519.rs b/src/ed25519.rs
index c6de0ed..033b6be 100644
--- a/src/ed25519.rs
+++ b/src/ed25519.rs
@@ -52,7 +52,7 @@ impl Deref for Ed25519PubKey {
 }
 
 impl Deref for Ed25519Signature {
-    type Target = [u8; 32];
+    type Target = [u8; 64];
 
     fn deref(&self) -> &Self::Target {
         self.0.deref().try_into().expect("this should never fail")