diff --git a/src/thermophysicalModels/radiationModels/radiationModel/viewFactor/viewFactor.C b/src/thermophysicalModels/radiationModels/radiationModel/viewFactor/viewFactor.C
index 6e45cbb..4451d8a 100644
--- a/src/thermophysicalModels/radiationModels/radiationModel/viewFactor/viewFactor.C
+++ b/src/thermophysicalModels/radiationModels/radiationModel/viewFactor/viewFactor.C
@@ -203,7 +203,7 @@ void Foam::radiation::viewFactor::initialise()
                 scalar delta = 1.0 - sumF;
                 for (label j=0; j<totalNCoarseFaces_; j++)
                 {
-                    Fmatrix_()[i][j] *= (1.0 - delta/(sumF + 0.001));
+                    Fmatrix_()[i][j] *= (1.0 + delta/(sumF + 0.001));
                 }
             }
         }