diff --git a/include/haproxy/stick_table-t.h b/include/haproxy/stick_table-t.h
index 132422980..d022de009 100644
--- a/include/haproxy/stick_table-t.h
+++ b/include/haproxy/stick_table-t.h
@@ -208,6 +208,9 @@ struct stktable {
 	unsigned int update;      /* uses updt_lock */
 	unsigned int localupdate; /* uses updt_lock */
 	unsigned int commitupdate;/* used to identify the latest local updates pending for sync, uses updt_lock */
+
+	THREAD_ALIGN(64);
+
 	__decl_thread(HA_RWLOCK_T updt_lock); /* lock protecting the updates part */
 };