diff --git a/src/lua/utils.lua b/src/lua/utils.lua
index 827315c..2889ad2 100644
--- a/src/lua/utils.lua
+++ b/src/lua/utils.lua
@@ -75,6 +75,9 @@ end
 function _M.get_mirror(host)
     ngx.log(ngx.DEBUG, "Looking up mirror for " .. host)
     local host_lower = host:lower()
+    if host_lower == ngx.ctx.jasima_host then
+        return "//" .. host_lower .. "/"  -- This will get made relative by sub_filter later
+    end
     local mirror = ngx.ctx.jasima_pool_map[host_lower]
     return "//" .. (mirror or host) .. "/"
 end