diff --git a/artiq/runtime/bridge.c b/artiq/runtime/bridge.c
index 02be42e4c..82fe3a16a 100644
--- a/artiq/runtime/bridge.c
+++ b/artiq/runtime/bridge.c
@@ -58,7 +58,7 @@ void bridge_main(void)
                 struct msg_brg_ttl_out *msg;
 
                 msg = (struct msg_brg_ttl_out *)umsg;
-                rtio_output_blind(msg->channel, 0, msg->value);
+                rtio_output_blind(msg->channel, 1, msg->value);
                 mailbox_acknowledge();
                 break;
             }
@@ -66,7 +66,7 @@ void bridge_main(void)
                 struct msg_brg_ttl_out *msg;
 
                 msg = (struct msg_brg_ttl_out *)umsg;
-                rtio_output_blind(msg->channel, 1, msg->value);
+                rtio_output_blind(msg->channel, 0, msg->value);
                 mailbox_acknowledge();
                 break;
             }