diff --git a/quantecon/_graph_tools.py b/quantecon/_graph_tools.py
index 3f4dca799..1f6c05db8 100644
--- a/quantecon/_graph_tools.py
+++ b/quantecon/_graph_tools.py
@@ -137,7 +137,7 @@ def node_labels(self, values):
         if values is None:
             self._node_labels = None
         else:
-            values = np.asarray(values)
+            values = np.asanyarray(values)
             if (values.ndim < 1) or (values.shape[0] != self.n):
                 raise ValueError(
                     'node_labels must be an array_like of length n'
diff --git a/quantecon/markov/core.py b/quantecon/markov/core.py
index 53d10bceb..2eecc55e9 100644
--- a/quantecon/markov/core.py
+++ b/quantecon/markov/core.py
@@ -227,7 +227,7 @@ def state_values(self, values):
         if values is None:
             self._state_values = None
         else:
-            values = np.asarray(values)
+            values = np.asanyarray(values)
             if (values.ndim < 1) or (values.shape[0] != self.n):
                 raise ValueError(
                     'state_values must be an array_like of length n'