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-rw-r--r--synapse/util/frozenutils.py5
1 files changed, 3 insertions, 2 deletions
diff --git a/synapse/util/frozenutils.py b/synapse/util/frozenutils.py
index f497b51f4a..4cd0566f4f 100644
--- a/synapse/util/frozenutils.py
+++ b/synapse/util/frozenutils.py
@@ -16,6 +16,7 @@
 from frozendict import frozendict
 import simplejson as json
 
+from six import string_types
 
 def freeze(o):
     t = type(o)
@@ -25,7 +26,7 @@ def freeze(o):
     if t is frozendict:
         return o
 
-    if t is str or t is unicode:
+    if isinstance(t, string_types):
         return o
 
     try:
@@ -41,7 +42,7 @@ def unfreeze(o):
     if t is dict or t is frozendict:
         return dict({k: unfreeze(v) for k, v in o.items()})
 
-    if t is str or t is unicode:
+    if isinstance(t, string_types):
         return o
 
     try: