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-rw-r--r--synapse/rest/admin/registration_tokens.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/rest/admin/registration_tokens.py b/synapse/rest/admin/registration_tokens.py
index 5a1c929d85..aba48f6e7b 100644
--- a/synapse/rest/admin/registration_tokens.py
+++ b/synapse/rest/admin/registration_tokens.py
@@ -113,7 +113,7 @@ class NewRegistrationTokenRestServlet(RestServlet):
         self.store = hs.get_datastore()
         self.clock = hs.get_clock()
         # A string of all the characters allowed to be in a registration_token
-        self.allowed_chars = string.ascii_letters + string.digits + "-_"
+        self.allowed_chars = string.ascii_letters + string.digits + "._~-"
         self.allowed_chars_set = set(self.allowed_chars)
 
     async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]: