diff --git a/src/OpenFOAM/dimensionSet/dimensionSets.H b/src/OpenFOAM/dimensionSet/dimensionSets.H
index 7836883ceb..93d9c1aadc 100644
--- a/src/OpenFOAM/dimensionSet/dimensionSets.H
+++ b/src/OpenFOAM/dimensionSet/dimensionSets.H
@@ -60,6 +60,7 @@ extern const dimensionSet dimVol;
 
 extern const dimensionSet dimDensity;
 extern const dimensionSet dimForce;
+extern const dimensionSet dimEnergy;
 
 extern const dimensionSet dimVelocity;
 extern const dimensionSet dimAcceleration;