diff --git a/http-signature-normalization-actix/examples/server.rs b/http-signature-normalization-actix/examples/server.rs
index fdc3a70..531ba0a 100644
--- a/http-signature-normalization-actix/examples/server.rs
+++ b/http-signature-normalization-actix/examples/server.rs
@@ -14,7 +14,7 @@ impl SignatureVerify for MyVerify {
     fn signature_verify(
         &mut self,
         algorithm: Option<Algorithm>,
-        _key_id: &str,
+        key_id: &str,
         signature: &str,
         signing_string: &str,
     ) -> Self::Future {
@@ -23,6 +23,10 @@ impl SignatureVerify for MyVerify {
             _ => return Err(MyError::Algorithm),
         };
 
+        if key_id != "my-key-id" {
+            return Err(MyError::Key);
+        }
+
         let decoded = base64::decode(signature).map_err(|_| MyError::Decode)?;
 
         Ok(decoded == signing_string.as_bytes())
@@ -61,6 +65,9 @@ enum MyError {
 
     #[fail(display = "Couldn't decode signature")]
     Decode,
+
+    #[fail(display = "Invalid key")]
+    Key,
 }
 
 impl ResponseError for MyError {