diff --git a/src/OpenFOAM/primitives/demandDrivenEntry/demandDrivenEntry.H b/src/OpenFOAM/primitives/demandDrivenEntry/demandDrivenEntry.H
index e56934d92eec6ef1f40a6c06c2091cb3062945d9..148dd795e611e409fb65f937253dbaf0b1c4d177 100644
--- a/src/OpenFOAM/primitives/demandDrivenEntry/demandDrivenEntry.H
+++ b/src/OpenFOAM/primitives/demandDrivenEntry/demandDrivenEntry.H
@@ -105,6 +105,9 @@ public:
 
     // Public Member Functions
 
+        //- Initialise
+        inline void initialise() const;
+
         //- Return the value
         inline const Type& value() const;
 
diff --git a/src/OpenFOAM/primitives/demandDrivenEntry/demandDrivenEntryI.H b/src/OpenFOAM/primitives/demandDrivenEntry/demandDrivenEntryI.H
index 5a6a3e31b315222cf9e7ad8503d8d9716980af62..c22ec7f6da1619617229fb68f7a994eb9fd3321f 100644
--- a/src/OpenFOAM/primitives/demandDrivenEntry/demandDrivenEntryI.H
+++ b/src/OpenFOAM/primitives/demandDrivenEntry/demandDrivenEntryI.H
@@ -28,13 +28,20 @@ License
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 template<class Type>
-inline const Type& Foam::demandDrivenEntry<Type>::value() const
+inline void Foam::demandDrivenEntry<Type>::initialise() const
 {
     if (!stored_)
     {
         dict_.lookup(keyword_) >> value_;
         stored_ = true;
     }
+}
+
+
+template<class Type>
+inline const Type& Foam::demandDrivenEntry<Type>::value() const
+{
+    initialise();
 
     return value_;
 }