diff --git a/bluepysnap/morph.py b/bluepysnap/morph.py
index 4a690633..0f200c90 100644
--- a/bluepysnap/morph.py
+++ b/bluepysnap/morph.py
@@ -51,7 +51,7 @@ def __init__(self, morph_dir, population, alternate_morphologies=None):
         self._alternate_morphologies = alternate_morphologies or {}
         self._population = population
 
-    def _get_morph_dir(self, extension):
+    def get_morphology_dir(self, extension):
         """Return morphology directory based on a given extension."""
         if extension == "swc":
             if not self._morph_dir:
@@ -79,7 +79,7 @@ def get_filepath(self, node_id, extension="swc"):
             raise BluepySnapError("node_id must be a int or a CircuitNodeId")
         name = self._population.get(node_id, Node.MORPHOLOGY)
 
-        return Path(self._get_morph_dir(extension), f"{name}.{extension}")
+        return Path(self.get_morphology_dir(extension), f"{name}.{extension}")
 
     def get(self, node_id, transform=False, extension="swc"):
         """Return MorphIO morphology object corresponding to `node_id`.
diff --git a/tests/test_morph.py b/tests/test_morph.py
index bf222338..5ede964e 100644
--- a/tests/test_morph.py
+++ b/tests/test_morph.py
@@ -44,6 +44,17 @@ def test_biophysical_in_library(self):
             circuit = Circuit(str(config_copy_path))
             assert isinstance(circuit.nodes["default"].morph, test_module.MorphHelper)
 
+    def test_get_morphology_dir(self):
+        with pytest.raises(
+            BluepySnapError, match="'neurolucida-asc' is not defined in 'alternate_morphologies'"
+        ):
+            self.test_obj.get_morphology_dir("asc")
+
+        with pytest.raises(BluepySnapError, match="Unsupported extension: fake"):
+            self.test_obj.get_morphology_dir("fake")
+
+        assert self.test_obj.get_morphology_dir("swc") == str(TEST_DATA_DIR / "morphologies")
+
     def test_get_filepath(self):
         node_id = 0
         assert self.nodes.get(node_id, properties="morphology") == "morph-A"
@@ -75,14 +86,6 @@ def test_get_filepath(self):
         with pytest.raises(BluepySnapError, match="node_id must be a int or a CircuitNodeId"):
             self.test_obj.get_filepath([0, 1])
 
-        with pytest.raises(
-            BluepySnapError, match="'neurolucida-asc' is not defined in 'alternate_morphologies'"
-        ):
-            self.test_obj.get_filepath(0, "asc")
-
-        with pytest.raises(BluepySnapError, match="Unsupported extension: fake"):
-            self.test_obj.get_filepath(0, "fake")
-
     def test_alternate_morphology(self):
         alternate_morphs = {"h5v1": str(self.morph_path)}
         test_obj = test_module.MorphHelper(