diff --git a/pyqtgraph/metaarray/MetaArray.py b/pyqtgraph/metaarray/MetaArray.py
index 18f7250a..1410e40c 100644
--- a/pyqtgraph/metaarray/MetaArray.py
+++ b/pyqtgraph/metaarray/MetaArray.py
@@ -357,7 +357,7 @@ class MetaArray(object):
         else:
             return np.array(self._data)
             
-    def __array__(self, dtype=None):
+    def __array__(self):
         ## supports np.array(metaarray_instance) 
         return self.asarray()