diff --git a/synapse/events/validator.py b/synapse/events/validator.py
index 2f4c8a1018..cf184748a1 100644
--- a/synapse/events/validator.py
+++ b/synapse/events/validator.py
@@ -13,9 +13,11 @@
# See the License for the specific language governing permissions and
# limitations under the License.
-from synapse.types import EventID, RoomID, UserID
-from synapse.api.errors import SynapseError
+from six import string_types
+
from synapse.api.constants import EventTypes, Membership
+from synapse.api.errors import SynapseError
+from synapse.types import EventID, RoomID, UserID
class EventValidator(object):
@@ -49,7 +51,7 @@ class EventValidator(object):
strings.append("state_key")
for s in strings:
- if not isinstance(getattr(event, s), basestring):
+ if not isinstance(getattr(event, s), string_types):
raise SynapseError(400, "Not '%s' a string type" % (s,))
if event.type == EventTypes.Member:
@@ -88,5 +90,5 @@ class EventValidator(object):
for s in keys:
if s not in d:
raise SynapseError(400, "'%s' not in content" % (s,))
- if not isinstance(d[s], basestring):
+ if not isinstance(d[s], string_types):
raise SynapseError(400, "Not '%s' a string type" % (s,))
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