diff --git a/src/OpenFOAM/primitives/ops/ops.H b/src/OpenFOAM/primitives/ops/ops.H
index f18ac14408..2706657f1b 100644
--- a/src/OpenFOAM/primitives/ops/ops.H
+++ b/src/OpenFOAM/primitives/ops/ops.H
@@ -82,6 +82,8 @@ EqOp(orEq, x  = (x || y))
 
 EqOp(eqMinus, x = -y)
 
+EqOp(nopEq, (void)x)
+
 #undef EqOp