diff --git a/src/lagrangian/intermediate/parcels/Templates/ReactingParcel/ReactingParcel.H b/src/lagrangian/intermediate/parcels/Templates/ReactingParcel/ReactingParcel.H
index 11b625bd7b..cc1348e7e4 100644
--- a/src/lagrangian/intermediate/parcels/Templates/ReactingParcel/ReactingParcel.H
+++ b/src/lagrangian/intermediate/parcels/Templates/ReactingParcel/ReactingParcel.H
@@ -328,6 +328,15 @@ public:
             static void readFields(ReactingCloud<ParcelType>& c);
 
             static void writeFields(const ReactingCloud<ParcelType>& c);
+
+
+    // Ostream Operator
+
+        friend Ostream& operator<< <ParcelType>
+        (
+            Ostream&,
+            const ReactingParcel<ParcelType>&
+        );
 };
 
 
diff --git a/src/lagrangian/intermediate/parcels/Templates/ThermoParcel/ThermoParcel.H b/src/lagrangian/intermediate/parcels/Templates/ThermoParcel/ThermoParcel.H
index e73e25814b..2be7e9547b 100644
--- a/src/lagrangian/intermediate/parcels/Templates/ThermoParcel/ThermoParcel.H
+++ b/src/lagrangian/intermediate/parcels/Templates/ThermoParcel/ThermoParcel.H
@@ -300,6 +300,15 @@ public:
             static void readFields(ThermoCloud<ParcelType>& c);
 
             static void writeFields(const ThermoCloud<ParcelType>& c);
+
+
+    // Ostream Operator
+
+        friend Ostream& operator<< <ParcelType>
+        (
+            Ostream&,
+            const ThermoParcel<ParcelType>&
+        );
 };