diff --git a/examples/master/ddb.pyon b/examples/master/ddb.pyon
index e853675c5..f7424636d 100644
--- a/examples/master/ddb.pyon
+++ b/examples/master/ddb.pyon
@@ -133,6 +133,9 @@
         "command": "lda_controller -p {port} --bind {bind}"
     },
 
+    "ttl_inout": "pmt0",
+    "ttl_out": "ttl0",
+
     "pmt": "pmt0",
     "bd_dds": "dds0",
     "bd_sw": "ttl0",