diff --git a/hosts/by-name/servo/services/cryptocurrencies/clightning-sane/clightning-sane b/hosts/by-name/servo/services/cryptocurrencies/clightning-sane/clightning-sane
index 618bbdce..68238a11 100755
--- a/hosts/by-name/servo/services/cryptocurrencies/clightning-sane/clightning-sane
+++ b/hosts/by-name/servo/services/cryptocurrencies/clightning-sane/clightning-sane
@@ -21,7 +21,8 @@ logger = logging.getLogger(__name__)
 
 RPC_FILE = "/var/lib/clightning/bitcoin/lightning-rpc"
 # CLTV (HLTC delta) of the final hop
-CLTV = 9
+# set this too low and you might get inadvertent channel closures (?)
+CLTV = 18
 
 class RebalanceError(Enum):
     FAIL_TEMPORARY = "FAIL_TEMPORARY"