diff --git a/zk-token-sdk/src/encryption/aes.rs b/zk-token-sdk/src/encryption/aes.rs
index 56303c3a1e..5cebb0166a 100644
--- a/zk-token-sdk/src/encryption/aes.rs
+++ b/zk-token-sdk/src/encryption/aes.rs
@@ -56,6 +56,12 @@ impl AESCiphertext {
     }
 }
 
+impl Default for AESCiphertext {
+    fn default() -> Self {
+        AESCiphertext([0_u8; 16])
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;