diff --git a/src/runtime2/communication.rs b/src/runtime2/communication.rs
index c4bee587535d12a0410fcc24ff6545f853431c3c..db992c070e8509a42d218b0a14cfeef565d0f096 100644
--- a/src/runtime2/communication.rs
+++ b/src/runtime2/communication.rs
@@ -75,6 +75,7 @@ pub enum ControlMessageContent {
     Ack,
     BlockPort(PortId),
     UnblockPort(PortId),
+    ClosePort(PortId),
     PortPeerChangedBlock(PortId),
     PortPeerChangedUnblock(PortId, CompId),
 }