diff --git a/pyop2/datatypes.py b/pyop2/datatypes.py
index ae0c4a922..49ff0cbc5 100644
--- a/pyop2/datatypes.py
+++ b/pyop2/datatypes.py
@@ -78,4 +78,5 @@ def __init__(self, name):
     def __repr__(self):
         return self.name
 
+
 mat_dtype = OpaqueType("Mat")