diff --git a/modules/navier_stokes/src/auxkernels/kEpsilonViscosityAux.C b/modules/navier_stokes/src/auxkernels/kEpsilonViscosityAux.C
index ab4650b08765..03ef6a6c8d06 100644
--- a/modules/navier_stokes/src/auxkernels/kEpsilonViscosityAux.C
+++ b/modules/navier_stokes/src/auxkernels/kEpsilonViscosityAux.C
@@ -159,6 +159,8 @@ kEpsilonViscosityAux::computeValue()
                       std::log(std::max(NS::E_turb_constant * y_plus, 1 + 1e-4)));
       mut_log = mu_wall - mu;
     }
+    else
+      mooseAssert(false,"Should not reach here");
 
     if (y_plus <= 5.0)
       // sub-laminar layer