diff --git a/flooding/flooding.proto b/flooding/flooding.proto
index 5bd16b8..e09b40d 100644
--- a/flooding/flooding.proto
+++ b/flooding/flooding.proto
@@ -10,7 +10,7 @@ message RPC {
 	}
 	
 	message Message {
-		optional string from = 1;
+		optional bytes from = 1;
 		optional bytes data = 2;
 		optional bytes seqno = 3;
 		repeated string topicCIDs = 4; // CID of topic descriptor object