diff --git a/chainsyncer/backend.py b/chainsyncer/backend.py
index 193b49c..79dc69e 100644
--- a/chainsyncer/backend.py
+++ b/chainsyncer/backend.py
@@ -322,4 +322,17 @@ class MemBackend:
 
 
     def get(self):
-        return (self.block_height, self.tx_height)
+        return ((self.block_height, self.tx_height), self.flags)
+
+
+    def register_filter(self, name):
+        pass
+
+
+    def complete_filter(self, n):
+        pass
+
+
+    def __str__(self):
+        return "syncer membackend chain {} cursor".format(self.get())
+        
diff --git a/setup.cfg b/setup.cfg
index d50f13b..8ad482f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = chainsyncer
-version = 0.0.1a18
+version = 0.0.1a19
 description = Generic blockchain syncer driver
 author = Louis Holbrook
 author_email = dev@holbrook.no