diff --git a/tests/gem_exec_alignment.c b/tests/gem_exec_alignment.c
index d975846e..95494f74 100644
--- a/tests/gem_exec_alignment.c
+++ b/tests/gem_exec_alignment.c
@@ -103,6 +103,8 @@ static void many(int fd)
 			execobj[i].flags = 1<<3; /* EXEC_OBJECT_SUPPORTS_48B_ADDRESS */
 	}
 	execobj[i].handle = gem_create(fd, 4096);
+	if ((gtt_size-1) >> 32)
+		execobj[i].flags = 1<<3; /* EXEC_OBJECT_SUPPORTS_48B_ADDRESS */
 	gem_write(fd, execobj[i].handle, 0, &bbe, sizeof(bbe));
 
 	memset(&execbuf, 0, sizeof(execbuf));