diff --git a/lib/device/device_id.c b/lib/device/device_id.c
index 06d64a494..bfee7d418 100644
--- a/lib/device/device_id.c
+++ b/lib/device/device_id.c
@@ -678,6 +678,9 @@ int device_ids_write(struct cmd_context *cmd)
 		cmd->enable_devices_file = 1;
 	}
 
+	if (test_mode())
+		return 1;
+
 	if (_devices_file_version[0]) {
 		if (sscanf(_devices_file_version, "%u.%u.%u", &df_major, &df_minor, &df_counter) != 3) {
 			/* don't update a file we can't parse */