diff --git a/applications/PfemFluidDynamicsApplication/tests/pfem_utilities_tests/Test_3D_Inlet/PFEMFluidMaterials.json b/applications/PfemFluidDynamicsApplication/tests/pfem_utilities_tests/Test_3D_Inlet/PFEMFluidMaterials.json
index 5ba1bfb948c9..cb01efc2653f 100644
--- a/applications/PfemFluidDynamicsApplication/tests/pfem_utilities_tests/Test_3D_Inlet/PFEMFluidMaterials.json
+++ b/applications/PfemFluidDynamicsApplication/tests/pfem_utilities_tests/Test_3D_Inlet/PFEMFluidMaterials.json
@@ -3,6 +3,9 @@
         "model_part_name" : "PfemFluidModelPart.Parts_Parts_Auto1",
         "properties_id"   : 1,
         "Material"        : {
+            "constitutive_law" : {
+                "name" : "Newtonian3DLaw"
+            },
             "Variables" : {
                 "DENSITY"           : 1000.0,
                 "DYNAMIC_VISCOSITY" : 0.001,