diff --git a/src/lua/header_filter.lua b/src/lua/header_filter.lua
index 7c91bcc..5c27431 100644
--- a/src/lua/header_filter.lua
+++ b/src/lua/header_filter.lua
@@ -15,13 +15,12 @@ if ngx.header["Content-Type"] then
        content_type:find("application/vnd.mpegurl") or
        content_type:find("application/x-mpegurl") then
         ngx.ctx.rewriting = true
-        ngx.header["Content-Length"] = nil
+        ngx.header["Content-Length"] = nil  -- We're rewriting the body so this has the wrong value if set
     end
 end
 
 if ngx.header["Location"] then
-    local pool_map = ngx.ctx.jasima_pool_map
-    if ngx.ctx.rewriting and pool_map then
+    if ngx.ctx.jasima_pool_map then
         local location = ngx.header["Location"]
         ngx.header["Location"] = location:gsub("//([a-zA-Z0-9%.%-]+%.[a-zA-Z0-9]+)/", utils.get_mirror)
     end