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-rw-r--r--synapse/util/caches/lrucache.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/util/caches/lrucache.py b/synapse/util/caches/lrucache.py
index 23e86ec110..5f9405c95f 100644
--- a/synapse/util/caches/lrucache.py
+++ b/synapse/util/caches/lrucache.py
@@ -29,7 +29,7 @@ def enumerate_leaves(node, depth):
 
 class LruCache(object):
     """Least-recently-used cache."""
-    def __init__(self, max_size, keylen, cache_type=dict):
+    def __init__(self, max_size, keylen=1, cache_type=dict):
         cache = cache_type()
         self.size = 0
         list_root = []