diff --git a/src/postprocess_utils.jl b/src/postprocess_utils.jl
index 61986c1..86dfa9e 100644
--- a/src/postprocess_utils.jl
+++ b/src/postprocess_utils.jl
@@ -1,6 +1,8 @@
 # This file is a part of JuliaFEM.
 # License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md
 
+importall Base
+
 using JuliaFEM
 
 """
diff --git a/test/test_elasticity_tetra.jl b/test/test_elasticity_tetra.jl
index 709c6c8..954ff37 100644
--- a/test/test_elasticity_tetra.jl
+++ b/test/test_elasticity_tetra.jl
@@ -49,7 +49,7 @@ end
     e2["displacement 3"] = 0.0
     e3 = Element(Tri3, [4, 3, 2])
     update!(e3, "geometry", nodes)
-    e3["displacement traction force n"] = 96.0
+    update!(e3, "surface pressure", -96.0)
     p1 = Problem(Elasticity, "tetra", 3)
     p2 = Problem(Dirichlet, "bc", 3, "displacement")
     push!(p1, e1, e3)
diff --git a/test/testdata/primitives.hdf b/test/testdata/primitives.hdf
index 3754c60..8d1ec86 100644
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diff --git a/test/testdata/primitives.med b/test/testdata/primitives.med
index 9d36ee9..7f6195a 100644
Binary files a/test/testdata/primitives.med and b/test/testdata/primitives.med differ