diff --git a/lib/pleroma/web/activity_pub/utils.ex b/lib/pleroma/web/activity_pub/utils.ex
index 8b5feef1c..266667f81 100644
--- a/lib/pleroma/web/activity_pub/utils.ex
+++ b/lib/pleroma/web/activity_pub/utils.ex
@@ -55,7 +55,7 @@ def maybe_splice_recipient(ap_id, params) do
 
     if need_splice do
       params
-      |> Map.put(params, "cc", [ap_id | cc_list])
+      |> Map.put("cc", [ap_id | cc_list])
     else
       params
     end