diff --git a/src/agent.jazz b/src/agent.jazz
index c942048..24c0d97 100644
--- a/src/agent.jazz
+++ b/src/agent.jazz
@@ -54,8 +54,7 @@ inline fn sign(reg u64 shared_mem sync_mem private_mem) -> reg u64 {
 
     mptr = extract_nth_ptr(sync_mem, shared_mem, 1);
 
-    len = extract_nth_ptr(sync_mem, shared_mem, 2);
-    len = (u64)[len];
+    len = (u64)[sync_mem + 16 * 2 + 8];
 
     sigptr = extract_nth_ptr(sync_mem, shared_mem, 3);