diff --git a/src/agent.jazz b/src/agent.jazz
index b560b5e..32cba63 100644
--- a/src/agent.jazz
+++ b/src/agent.jazz
@@ -40,6 +40,8 @@ export fn agent_start(reg u64 shared_mem sync_mem private_mem) {
     reg u64 key_id;
     stack u64 spill_sync_mem spill_shared_mem spill_private_mem;
 
+    key_id = 0;
+
     spill_sync_mem = sync_mem;
     spill_shared_mem = shared_mem;
     spill_private_mem = private_mem;