diff --git a/lib/philomena/relative_date.ex b/lib/philomena/relative_date.ex
index 3d3aaaf5..1c678d15 100644
--- a/lib/philomena/relative_date.ex
+++ b/lib/philomena/relative_date.ex
@@ -83,7 +83,7 @@ defmodule Philomena.RelativeDate do
         {:ok, datetime}
 
       _error ->
-        parse_relative(input)
+        parse_relative(String.downcase(input))
     end
   end