diff --git a/lib/splunk_logging.rb b/lib/splunk_logging.rb
index 39f58763f..d30dfd7f6 100644
--- a/lib/splunk_logging.rb
+++ b/lib/splunk_logging.rb
@@ -5,7 +5,9 @@ module SplunkLogging
     end
   end
   def add_with_splunk(arg1, log_hash = nil, arg3 = nil, &block)
-    add_without_splunk(arg1, format_hash(log_hash), arg3, &block)
+    string = format_hash(log_hash)
+    string << "pid=#{Process.pid} "
+    add_without_splunk(arg1, string, arg3, &block)
   end
   def format_hash(hash)
     if hash.respond_to?(:keys)