diff --git a/util/mornafah.c b/util/mornafah.c
index 5901459..a191c20 100644
--- a/util/mornafah.c
+++ b/util/mornafah.c
@@ -68,7 +68,7 @@ static void * local_thread(void *)
 			printf("Local thread(%d): flushing %p.\n", local_core, addr);
 		}
 
-		_mm_clflushopt(addr);
+		_mm_clflush(addr);
 		_mm_mfence();
 
 		atomic_signal_fence(memory_order_seq_cst);
@@ -105,7 +105,7 @@ static void * remote_thread(void *)
 			temp = *addr;
 			_mm_mfence();
 		} else {
-			_mm_clflushopt(addr);
+			_mm_clflush(addr);
 			_mm_mfence();
 		}