diff --git a/src/Base/Unit.h b/src/Base/Unit.h
index 77b325a784c5..5e957a97a70f 100644
--- a/src/Base/Unit.h
+++ b/src/Base/Unit.h
@@ -155,6 +155,7 @@ class BaseExport Unit
     static const Unit Force;
     static const Unit Work;
     static const Unit Power;
+    static const Unit Moment;
 
     static const Unit SpecificEnergy;
     static const Unit ThermalConductivity;