diff --git a/neurom/analysis/morphtree.py b/neurom/analysis/morphtree.py
index <HASH>..<HASH> 100644
--- a/neurom/analysis/morphtree.py
+++ b/neurom/analysis/morphtree.py
@@ -87,8 +87,6 @@ def find_tree_type(tree):
 
     tree.type = tree_types[int(np.median(types))]
 
-    return tree
-
 
 def get_tree_type(tree):
 
@@ -99,7 +97,7 @@ def get_tree_type(tree):
     """
 
     if not hasattr(tree, 'type'):
-        tree = find_tree_type(tree)
+        find_tree_type(tree)
 
     return tree.type
 
diff --git a/neurom/analysis/tests/test_morphtree.py b/neurom/analysis/tests/test_morphtree.py
index <HASH>..<HASH> 100644
--- a/neurom/analysis/tests/test_morphtree.py
+++ b/neurom/analysis/tests/test_morphtree.py
@@ -126,7 +126,7 @@ def test_get_tree_type():
             del test_tree.type
         # tree.type should be computed here.
         nt.ok_(get_tree_type(test_tree) == tree_types[en_tree])
-        test_tree = find_tree_type(test_tree)
+        find_tree_type(test_tree)
         # tree.type should already exists here, from previous action.
         nt.ok_(get_tree_type(test_tree) == tree_types[en_tree])
Minor change in morphtree find_tree_type to make consistent with make_tree.

Change-Id: I9d0f<I>d3b4a0eebac7c8dbb<I>e<I>e<I>a<I>ada