diff --git a/synapse/types.py b/synapse/types.py
index 8d3a8d88cc..84631d177d 100644
--- a/synapse/types.py
+++ b/synapse/types.py
@@ -112,7 +112,7 @@ class StreamToken(
     def from_string(cls, string):
         try:
             keys = string.split(cls._SEPARATOR)
-            if len(keys) == len(cls._fields) - 1:
+            while len(keys) < len(cls._fields):
                 # i.e. old token from before receipt_key
                 keys.append("0")
             return cls(*keys)
diff --git a/tests/rest/client/v1/test_presence.py b/tests/rest/client/v1/test_presence.py
index 29d9bbaad4..0e3b922246 100644
--- a/tests/rest/client/v1/test_presence.py
+++ b/tests/rest/client/v1/test_presence.py
@@ -369,7 +369,7 @@ class PresenceEventStreamTestCase(unittest.TestCase):
         # all be ours
 
         # I'll already get my own presence state change
-        self.assertEquals({"start": "0_1_0_0", "end": "0_1_0_0", "chunk": []},
+        self.assertEquals({"start": "0_1_0_0_0", "end": "0_1_0_0_0", "chunk": []},
             response
         )
 
@@ -388,7 +388,7 @@ class PresenceEventStreamTestCase(unittest.TestCase):
                 "/events?from=s0_1_0&timeout=0", None)
 
         self.assertEquals(200, code)
-        self.assertEquals({"start": "s0_1_0_0", "end": "s0_2_0_0", "chunk": [
+        self.assertEquals({"start": "s0_1_0_0_0", "end": "s0_2_0_0_0", "chunk": [
             {"type": "m.presence",
              "content": {
                  "user_id": "@banana:test",