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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 0e445e01d7..bf094c9386 100644
--- a/synapse/util/frozenutils.py
+++ b/synapse/util/frozenutils.py
@@ -13,7 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from canonicaljson import json
+import json
+
 from frozendict import frozendict
 
 
@@ -66,5 +67,5 @@ def _handle_frozendict(obj):
 # A JSONEncoder which is capable of encoding frozendicts without barfing.
 # Additionally reduce the whitespace produced by JSON encoding.
 frozendict_json_encoder = json.JSONEncoder(
-    default=_handle_frozendict, separators=(",", ":"),
+    allow_nan=False, separators=(",", ":"), default=_handle_frozendict,
 )