diff --git a/lib/rack/reverse_proxy.rb b/lib/rack/reverse_proxy.rb
index ddadd3f..4fa7a64 100644
--- a/lib/rack/reverse_proxy.rb
+++ b/lib/rack/reverse_proxy.rb
@@ -90,6 +90,8 @@ def get_matcher path
     def create_response_headers http_response
       response_headers = Rack::Utils::HeaderHash.new(http_response.to_hash)
       # handled by Rack
+      response_headers.delete('content-length')
+      # handled by Rack
       response_headers.delete('status')
       # TODO: figure out how to handle chunked responses
       response_headers.delete('transfer-encoding')