diff --git a/lib/philomena/slug.ex b/lib/philomena/slug.ex
index fbbcef5e..1569aa5e 100644
--- a/lib/philomena/slug.ex
+++ b/lib/philomena/slug.ex
@@ -42,9 +42,9 @@ defmodule Philomena.Slug do
     |> String.replace(":", "-colon-")
     |> String.replace(".", "-dot-")
     |> String.replace("+", "-plus-")
-    |> URI.encode()
+    |> URI.encode_www_form()
     |> String.replace("%20", "+")
   end
 
   def slug(_string), do: ""
-end
\ No newline at end of file
+end