diff --git a/menpo/io/input/landmark.py b/menpo/io/input/landmark.py
index 58557d2e8..6b4c28039 100644
--- a/menpo/io/input/landmark.py
+++ b/menpo/io/input/landmark.py
@@ -291,7 +291,8 @@ def _parse_format(self, asset=None):
 def _ljson_parse_null_values(points_list):
     filtered_points = [np.nan if x is None else x
                        for x in itertools.chain(*points_list)]
-    return np.array(filtered_points).reshape([-1, len(points_list[0])])
+    return np.array(filtered_points,
+                    dtype=np.float).reshape([-1, len(points_list[0])])
 
 
 def _parse_ljson_v1(lms_dict):