diff --git a/api/client-server/keys.yaml b/api/client-server/keys.yaml
index 313e30f4..317a1295 100644
--- a/api/client-server/keys.yaml
+++ b/api/client-server/keys.yaml
@@ -137,7 +137,7 @@ paths:
                 description: |-
                   If the client is fetching keys as a result of a device update received
                   in a sync request, this should be the 'since' token of that sync request,
-		  or any later sync token. This allows the server to ensure its response
+                  or any later sync token. This allows the server to ensure its response
                   contains the keys advertised by the notification in that sync.
             required:
               - device_keys