diff --git a/communication_techniques/include/batch_queue_comm.h b/communication_techniques/include/batch_queue_comm.h
index 9d552d2..f96249f 100644
--- a/communication_techniques/include/batch_queue_comm.h
+++ b/communication_techniques/include/batch_queue_comm.h
@@ -15,6 +15,7 @@
 struct channel
 {
 	void * volatile buf[2 * BUF_SIZE / sizeof(void *)] __attribute__ ((aligned (CACHE_LINE_SIZE)));
+	int unused[20] __attribute__ ((aligned (CACHE_LINE_SIZE)));
 	volatile int  state __attribute__ ((aligned (CACHE_LINE_SIZE)));
 	int  idx __attribute__ ((aligned (CACHE_LINE_SIZE)));
 };