diff --git a/src/diffpy/srfit/tests/testliterals.py b/src/diffpy/srfit/tests/testliterals.py
index 7667be3e..542cab6f 100644
--- a/src/diffpy/srfit/tests/testliterals.py
+++ b/src/diffpy/srfit/tests/testliterals.py
@@ -118,7 +118,7 @@ def testAddLiteral(self):
         """Test adding a literal to an operator node."""
         op = self.op
 
-        self.assertRaises(ValueError, op.getValue)
+        self.assertRaises(TypeError, op.getValue)
         op._value = 1
         self.assertEqual(op.getValue(), 1)
 
@@ -127,7 +127,7 @@ def testAddLiteral(self):
         b = literals.Argument(name = "b", value = 0)
 
         op.addLiteral(a)
-        self.assertRaises(ValueError, op.getValue)
+        self.assertRaises(TypeError, op.getValue)
 
         op.addLiteral(b)
         self.assertAlmostEqual(0, op.value)
diff --git a/src/diffpy/srfit/tests/testvisitors.py b/src/diffpy/srfit/tests/testvisitors.py
index 2089547b..6dda1fbc 100644
--- a/src/diffpy/srfit/tests/testvisitors.py
+++ b/src/diffpy/srfit/tests/testvisitors.py
@@ -195,7 +195,7 @@ def testSimpleFunction(self):
         self.assertTrue(plus2.hasObserver(mult._flush))
 
         # plus2 has no arguments yet. Verify this.
-        self.assertRaises(ValueError, mult.getValue)
+        self.assertRaises(TypeError, mult.getValue)
         # Add the arguments to plus2.
         plus2.addLiteral(v4)
         plus2.addLiteral(v5)