diff --git a/little_boxes/httpsig.py b/little_boxes/httpsig.py
index 96bd3dd..c6a7941 100644
--- a/little_boxes/httpsig.py
+++ b/little_boxes/httpsig.py
@@ -63,7 +63,7 @@ def _body_digest(body: str) -> str:
 
 def _get_public_key(key_id: str) -> Key:
     actor = get_backend().fetch_iri(key_id)
-    k = Key(actor["id"])
+    k = Key(actor["id"], key_id)
     k.load_pub(actor["publicKey"]["publicKeyPem"])
     return k
 
diff --git a/little_boxes/key.py b/little_boxes/key.py
index b0a4f70..5002c63 100644
--- a/little_boxes/key.py
+++ b/little_boxes/key.py
@@ -34,7 +34,7 @@ class Key(object):
         self.privkey = k
 
     def key_id(self) -> str:
-        return f"{self.owner}#main-key"
+        return self._id or f"{self.owner}#main-key"
 
     def to_dict(self) -> Dict[str, Any]:
         return {
diff --git a/tests/test_httpsig.py b/tests/test_httpsig.py
index 47e46b7..2a378d5 100644
--- a/tests/test_httpsig.py
+++ b/tests/test_httpsig.py
@@ -16,9 +16,9 @@ def test_httpsig():
     back = InMemBackend()
     ap.use_backend(back)
 
-    k = Key("https://lol.com")
+    k = Key("https://lol.com", "https://lol.com#lol")
     k.new()
-    back.FETCH_MOCK["https://lol.com#main-key"] = {
+    back.FETCH_MOCK["https://lol.com#lol"] = {
         "publicKey": k.to_dict(),
         "id": "https://lol.com",
     }