diff --git a/lib/pleroma/signature.ex b/lib/pleroma/signature.ex
index 3d33fcd62..c4ac2c87e 100644
--- a/lib/pleroma/signature.ex
+++ b/lib/pleroma/signature.ex
@@ -10,7 +10,7 @@ defmodule Pleroma.Signature do
   alias Pleroma.User
   alias Pleroma.Web.ActivityPub.ActivityPub
 
-  @known_suffixes ["/publickey", "/main-key"]
+  @known_suffixes ["/publickey", "/main-key", "#key"]
 
   def key_id_to_actor_id(key_id) do
     uri =
diff --git a/test/pleroma/signature_test.exs b/test/pleroma/signature_test.exs
index e2d02fe4c..c946da9ef 100644
--- a/test/pleroma/signature_test.exs
+++ b/test/pleroma/signature_test.exs
@@ -153,6 +153,11 @@ defmodule Pleroma.SignatureTest do
                {:ok, "https://example.com/users/1234"}
     end
 
+    test "it deduces the actor ID for bridgy" do
+      assert Signature.key_id_to_actor_id("https://example.com/1234#key") ==
+        {:ok, "https://example.com/1234"}
+    end
+
     test "it calls webfinger for 'acct:' accounts" do
       with_mock(Pleroma.Web.WebFinger,
         finger: fn _ -> {:ok, %{"ap_id" => "https://gensokyo.2hu/users/raymoo"}} end