diff --git a/changelog.d/3280-fix-emoji-ids.fix b/changelog.d/3280-fix-emoji-ids.fix
new file mode 100644
index 000000000..1bce5b653
--- /dev/null
+++ b/changelog.d/3280-fix-emoji-ids.fix
@@ -0,0 +1 @@
+Fix Emoji object IDs not always being valid
diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index edfe73a25..4d851559f 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -913,9 +913,11 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
 
   def add_emoji_tags(object), do: object
 
-  defp build_emoji_tag({name, url}) do
+  def build_emoji_tag({name, url}) do
+    url = URI.encode(url)
+
     %{
-      "icon" => %{"url" => "#{URI.encode(url)}", "type" => "Image"},
+      "icon" => %{"url" => "#{url}", "type" => "Image"},
       "name" => ":" <> name <> ":",
       "type" => "Emoji",
       "updated" => "1970-01-01T00:00:00Z",
diff --git a/test/pleroma/web/activity_pub/transmogrifier/emoji_tag_building_test.exs b/test/pleroma/web/activity_pub/transmogrifier/emoji_tag_building_test.exs
new file mode 100644
index 000000000..c632c199c
--- /dev/null
+++ b/test/pleroma/web/activity_pub/transmogrifier/emoji_tag_building_test.exs
@@ -0,0 +1,14 @@
+defmodule Pleroma.Web.ActivityPub.Transmogrifier.EmojiTagBuildingTest do
+  use Pleroma.DataCase, async: true
+
+  alias Pleroma.Web.ActivityPub.Transmogrifier
+
+  test "it encodes the id to be a valid url" do
+    name = "hanapog"
+    url = "https://misskey.local.live/emojis/hana pog.png"
+
+    tag = Transmogrifier.build_emoji_tag({name, url})
+
+    assert tag["id"] == "https://misskey.local.live/emojis/hana%20pog.png"
+  end
+end