diff --git a/proto/umbra/invite.proto b/proto/umbra/invite.proto
index cd592a7..38cfb76 100644
--- a/proto/umbra/invite.proto
+++ b/proto/umbra/invite.proto
@@ -3,5 +3,5 @@ syntax = "proto3";
 package umbra.invite;
 
 message InvitePrivateV1 {
-    string participants = 1;
+    repeated string participants = 1;
 }
\ No newline at end of file