diff --git a/log_manager.cpp b/log_manager.cpp
index 29c0ffe..b535039 100644
--- a/log_manager.cpp
+++ b/log_manager.cpp
@@ -71,6 +71,9 @@
         metalist.insert(metamap->second.begin(), metamap->second.end());
     }
 
+    //Add _PID field information in AdditionalData.
+    metalist.insert("_PID");
+
     std::vector<std::string> additionalData;
 
     // Read the journal from the end to get the most recent entry first.