diff --git a/tools/odbclient/src/odbclient/odbclient.py b/tools/odbclient/src/odbclient/odbclient.py
index 0215fdca..42dce924 100644
--- a/tools/odbclient/src/odbclient/odbclient.py
+++ b/tools/odbclient/src/odbclient/odbclient.py
@@ -221,7 +221,7 @@ def element_connectivity(self, instance_name, elset_name=''):
         """
         index, connectivity = self._query('get_connectivity', (instance_name, elset_name))
         return pd.DataFrame({'connectivity': connectivity},
-                            index=pd.Int64Index(index, name='element_id'))
+                            index=pd.Index(index, name='element_id', dtype=np.int64))
 
     def nset_names(self, instance_name=''):
         """Query the available node set names.
@@ -257,7 +257,7 @@ def node_ids(self, nset_name, instance_name=''):
             The node ids as :class:`pandas.Index`
         """
         node_ids = self._query('get_node_set', (instance_name, nset_name))
-        return pd.Index(node_ids, name='node_id')
+        return pd.Index(node_ids, name='node_id', dtype=np.int64)
 
     def elset_names(self, instance_name=''):
         """Query the available element set names.
@@ -293,7 +293,7 @@ def element_ids(self, elset_name, instance_name=''):
             The element ids as :class:`pandas.Index`
         """
         element_ids = self._query('get_element_set', (instance_name, elset_name))
-        return pd.Int64Index(element_ids, name='element_id')
+        return pd.Index(element_ids, name='element_id', dtype=np.int64)
 
     def step_names(self):
         """Query the step names from the odb file.
@@ -367,9 +367,9 @@ def variable(self, variable_name, instance_name, step_name, frame_id, nset_name=
 
         index_labels = _ascii(_decode, index_labels)
         if len(index_labels) > 1:
-            index = pd.DataFrame(index_data, columns=index_labels).set_index(index_labels).index
+            index = pd.DataFrame(index_data, columns=index_labels, dtype=np.int64).set_index(index_labels).index
         else:
-            index = pd.Int64Index(index_data[:, 0], name=index_labels[0])
+            index = pd.Index(index_data[:, 0], name=index_labels[0], dtype=np.int64)
 
         column_names = _ascii(_decode, labels)
         return pd.DataFrame(values, index=index, columns=column_names)
diff --git a/tools/odbclient/tests/test_odbclient.py b/tools/odbclient/tests/test_odbclient.py
index 03adff71..0eda5392 100644
--- a/tools/odbclient/tests/test_odbclient.py
+++ b/tools/odbclient/tests/test_odbclient.py
@@ -54,6 +54,20 @@ def test_odbclient_node_coordinates(client):
     pd.testing.assert_frame_equal(client.node_coordinates('PART-1-1'), expected)
 
 
+def test_odbclient_node_ids(client):
+    result = client.node_ids('FIX', 'PART-1-1')
+    expected = pd.Index([1, 2, 3, 4, 22, 27, 31, 32], dtype='int64', name='node_id')
+
+    pd.testing.assert_index_equal(result, expected)
+
+
+def test_odbclient_element_ids(client):
+    result = client.element_ids('FIX', 'PART-1-1')
+    expected = pd.Index([1], dtype='int64', name='element_id')
+
+    pd.testing.assert_index_equal(result, expected)
+
+
 def test_odbclient_node_coordinates_invalid_instance_name(client):
     with pytest.raises(KeyError, match="Invalid instance name 'nonexistent'."):
         client.node_coordinates('nonexistent')
@@ -120,13 +134,19 @@ def test_variable_names(client):
 
 
 def test_variable_stress_element_nodal(client):
-    expected = pd.read_csv('tests/stress_element_nodal.csv',
-                           index_col=['node_id', 'element_id'])
+    expected = pd.read_csv('tests/stress_element_nodal.csv', index_col=['node_id', 'element_id'])
     result = client.variable('S', 'PART-1-1', 'Load', 1)
 
     pd.testing.assert_frame_equal(result, expected)
 
 
+def test_variable_evol(client):
+    result = client.variable('EVOL', 'PART-1-1', 'Load', 1)
+    expected = pd.DataFrame({'EVOL': [1000.]}, index=pd.Index([1, 2, 3, 4], name='element_id'))
+
+    pd.testing.assert_frame_equal(result, expected)
+
+
 def test_variable_invalid_instance_name(client):
     with pytest.raises(KeyError, match="nonexistent"):
         client.variable('S', 'nonexistent', 'Load', 1)