diff --git a/server/rosetta/services/construction.go b/server/rosetta/services/construction.go
index 0e62327ed250..745efbc62bf6 100644
--- a/server/rosetta/services/construction.go
+++ b/server/rosetta/services/construction.go
@@ -267,8 +267,7 @@ func (sn SingleNetwork) ConstructionPreprocess(ctx context.Context, request *typ
 
 	memo, ok := request.Metadata["memo"]
 	if !ok {
-		return nil, rosetta.ErrInvalidMemo.RosettaError()
-
+		memo = ""
 	}
 
 	var res = &types.ConstructionPreprocessResponse{