diff --git a/tests/test.py b/tests/test.py
index 0ff7bcf..60670a8 100644
--- a/tests/test.py
+++ b/tests/test.py
@@ -75,7 +75,7 @@ class TestStructures(unittest.TestCase):
         self.assertAlmostEqual(m2.molar_mass(),18,1)
         self.assertAlmostEqual(m2.density(),1.0,1)
 
-        m3 = catima.get_material(301)
+        m3 = catima.get_material(3001)
         self.assertEqual(m3.ncomponents(),0)
         self.assertAlmostEqual(m3.molar_mass(),0,1)
         self.assertAlmostEqual(m3.density(),0.0,1)