diff --git a/src/transaction.rs b/src/transaction.rs
index 0b7484f..11b330a 100644
--- a/src/transaction.rs
+++ b/src/transaction.rs
@@ -50,6 +50,8 @@ impl Display for Error {
     }
 }
 
+impl std::error::Error for Error {}
+
 pub struct ApduResponse {
     pub buf: Vec<u8>,
     pub sw1: u8,