diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index fcf8b4d183..38f5ec0ac5 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -255,7 +255,8 @@ class DataStore(RoomMemberStore, RoomStore,
     @defer.inlineCallbacks
     def get_current_state(self, room_id, event_type=None, state_key=""):
         del_sql = (
-            "SELECT event_id FROM redactions WHERE redacts = e.event_id"
+            "SELECT event_id FROM redactions WHERE redacts = e.event_id "
+            "LIMIT 1"
         )
 
         sql = (
diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py
index 84c462330b..958e730591 100644
--- a/synapse/storage/roommember.py
+++ b/synapse/storage/roommember.py
@@ -183,7 +183,8 @@ class RoomMemberStore(SQLBaseStore):
 
     def _get_members_query_txn(self, txn, where_clause, where_values):
         del_sql = (
-            "SELECT event_id FROM redactions WHERE redacts = e.event_id"
+            "SELECT event_id FROM redactions WHERE redacts = e.event_id "
+            "LIMIT 1"
         )
 
         sql = (
diff --git a/synapse/storage/stream.py b/synapse/storage/stream.py
index 91baa18319..d61f909939 100644
--- a/synapse/storage/stream.py
+++ b/synapse/storage/stream.py
@@ -158,7 +158,8 @@ class StreamStore(SQLBaseStore):
         )
 
         del_sql = (
-            "SELECT event_id FROM redactions WHERE redacts = e.event_id"
+            "SELECT event_id FROM redactions WHERE redacts = e.event_id "
+            "LIMIT 1"
         )
 
         if limit:
@@ -230,7 +231,8 @@ class StreamStore(SQLBaseStore):
             limit_str = ""
 
         del_sql = (
-            "SELECT event_id FROM redactions WHERE redacts = events.event_id"
+            "SELECT event_id FROM redactions WHERE redacts = events.event_id "
+            "LIMIT 1"
         )
 
         sql = (
@@ -272,7 +274,8 @@ class StreamStore(SQLBaseStore):
         # TODO (erikj): Handle compressed feedback
 
         del_sql = (
-            "SELECT event_id FROM redactions WHERE redacts = events.event_id"
+            "SELECT event_id FROM redactions WHERE redacts = events.event_id "
+            "LIMIT 1"
         )
 
         sql = (