diff --git a/lib/logstash/inputs/gelf.rb b/lib/logstash/inputs/gelf.rb
index 17b56c9..49f6e5e 100644
--- a/lib/logstash/inputs/gelf.rb
+++ b/lib/logstash/inputs/gelf.rb
@@ -111,7 +111,6 @@ def udp_listener(output_queue)
       event["source_host"] = client[3]
       if event["timestamp"].is_a?(Numeric)
         event.timestamp = LogStash::Timestamp.at(event["timestamp"])
-        event.remove("timestamp")
       end
       remap_gelf(event) if @remap
       strip_leading_underscore(event) if @strip_leading_underscore