diff --git a/changelog.d/21.bugfix b/changelog.d/21.bugfix
new file mode 100644
index 0000000000..630d7812f7
--- /dev/null
+++ b/changelog.d/21.bugfix
@@ -0,0 +1 @@
+Fix resetting user passwords via a phone number.
diff --git a/synapse/rest/client/v2_alpha/account.py b/synapse/rest/client/v2_alpha/account.py
index 9bf4afac66..974465e90c 100644
--- a/synapse/rest/client/v2_alpha/account.py
+++ b/synapse/rest/client/v2_alpha/account.py
@@ -339,7 +339,7 @@ class PasswordResetSubmitTokenServlet(RestServlet):
 
         assert_valid_client_secret(body["client_secret"])
 
-        valid, _ = yield self.datastore.validate_threepid_validation_token(
+        valid, _ = yield self.datastore.validate_threepid_session(
             body['sid'],
             body['client_secret'],
             body['token'],