diff --git a/src/finiteVolume/fields/fvPatchFields/derived/surfaceNormalFixedValue/surfaceNormalFixedValueFvPatchVectorField.C b/src/finiteVolume/fields/fvPatchFields/derived/surfaceNormalFixedValue/surfaceNormalFixedValueFvPatchVectorField.C
index 22133c229b..237e602e98 100644
--- a/src/finiteVolume/fields/fvPatchFields/derived/surfaceNormalFixedValue/surfaceNormalFixedValueFvPatchVectorField.C
+++ b/src/finiteVolume/fields/fvPatchFields/derived/surfaceNormalFixedValue/surfaceNormalFixedValueFvPatchVectorField.C
@@ -54,7 +54,16 @@ surfaceNormalFixedValueFvPatchVectorField
     fixedValueFvPatchVectorField(p, iF),
     refValue_(ptf.refValue_, mapper)
 {
-    fvPatchVectorField::operator=(refValue_*patch().nf());
+    // Note: calculate product only on ptf to avoid multiplication on
+    // unset values in reconstructPar.
+    fixedValueFvPatchVectorField::operator=
+    (
+        vectorField
+        (
+            ptf.refValue_*ptf.patch().nf(),
+            mapper
+        )
+    );
 }