diff --git a/lib/pleroma/emoji/pack.ex b/lib/pleroma/emoji/pack.ex
index 85f7e1877..afc341853 100644
--- a/lib/pleroma/emoji/pack.ex
+++ b/lib/pleroma/emoji/pack.ex
@@ -100,7 +100,7 @@ def add_file(%Pack{} = pack, _, _, %Plug.Upload{content_type: "application/zip"}
         {:ok, _emoji_files} =
           :zip.unzip(
             to_charlist(file.path),
-            [{:file_list, Enum.map(emojies, & &1[:path])}, {:cwd, tmp_dir}]
+            [{:file_list, Enum.map(emojies, & &1[:path])}, {:cwd, String.to_charlist(tmp_dir)}]
           )
 
         {_, updated_pack} =