diff --git a/src/transfers/MultiAppNeutronicsSpectrumTransfer.C b/src/transfers/MultiAppNeutronicsSpectrumTransfer.C
index 3a73d859..fb15238b 100644
--- a/src/transfers/MultiAppNeutronicsSpectrumTransfer.C
+++ b/src/transfers/MultiAppNeutronicsSpectrumTransfer.C
@@ -58,8 +58,8 @@ MultiAppNeutronicsSpectrumTransfer::execute()
       for (THREAD_ID tid = 0; tid < libMesh::n_threads(); ++tid)
       {
         PKAGeneratorNeutronicsBase & pka_uo = const_cast<PKAGeneratorNeutronicsBase &>(
-            _multi_app->appProblem(i).getUserObject<PKAGeneratorNeutronicsBase>(_pka_generator_name,
-                                                                                tid));
+            _multi_app->appProblemBase(i).getUserObject<PKAGeneratorNeutronicsBase>(
+                _pka_generator_name, tid));
         pka_uo.setPDF(zaids, energies, probabilities);
       }
     }
diff --git a/tests/radiation_damage/coupled_fission_mockup/damage_sub.i b/tests/radiation_damage/coupled_fission_mockup/damage_sub.i
index 98da393b..a5699270 100644
--- a/tests/radiation_damage/coupled_fission_mockup/damage_sub.i
+++ b/tests/radiation_damage/coupled_fission_mockup/damage_sub.i
@@ -136,7 +136,6 @@
 [UserObjects]
   [./neutronics_fission_generator]
     type = PKAFissionFragmentNeutronics
-    relative_density = 1
     partial_reaction_rates = '2.0e-11 0 0'
   [../]
   [./rasterizer]