diff --git a/src/OpenFOAM/primitives/ops/ops.H b/src/OpenFOAM/primitives/ops/ops.H
index 427679118f..53100da0bc 100644
--- a/src/OpenFOAM/primitives/ops/ops.H
+++ b/src/OpenFOAM/primitives/ops/ops.H
@@ -178,6 +178,7 @@ Op(greaterEq, x >= y)
 weightedOp(multiply, (weight*y))
 
 #undef Op
+#undef weightedOp
 
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //