diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index 71db16d0e5c05a00f63dca0dd2d3a6a5f6491d7a..456e4bd45d7240f573287b2b1680670a8afc1cd3 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -82,7 +82,7 @@ class StateStore(SQLBaseStore):
         if context.current_state is None:
             return
 
-        state_events = context.current_state
+        state_events = dict(context.current_state)
 
         if event.is_state():
             state_events[(event.type, event.state_key)] = event