diff --git a/images/remote-image.proto b/images/remote-image.proto
index 1212627e3..f6b81503a 100644
--- a/images/remote-image.proto
+++ b/images/remote-image.proto
@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 message local_image_entry {
 	required string name		= 1;
 	required string snapshot_id	= 2;