diff --git a/stytra/gui/fishplots.py b/stytra/gui/fishplots.py
index 49ef1fe..fd1cc50 100644
--- a/stytra/gui/fishplots.py
+++ b/stytra/gui/fishplots.py
@@ -13,7 +13,7 @@ from lightparam.gui import ParameterGui
 from scipy.ndimage.filters import gaussian_filter1d
 
 
-class StreamingPositionPlot(pg.GraphicsWindow):
+class StreamingPosition(pg.GraphicsView):
     """Plot that displays the virtual position of the fish"""
 
     def __init__(self, *args, data_accumulator, n_points=500, **kwargs):
diff --git a/stytra/utilities.py b/stytra/utilities.py
index f79c4db..feaa7ef 100644
--- a/stytra/utilities.py
+++ b/stytra/utilities.py
@@ -239,7 +239,7 @@ def recursive_update(d, u):
     :return:
     """
     for k, v in u.items():
-        if isinstance(v, collections.Mapping):
+        if isinstance(v, collections.ChainMap):
             d[k] = recursive_update(d.get(k, {}), v)
         else:
             d[k] = v