diff --git a/xwords4/relay/xwrelay.h b/xwords4/relay/xwrelay.h
index c277e4884..b26e0728f 100644
--- a/xwords4/relay/xwrelay.h
+++ b/xwords4/relay/xwrelay.h
@@ -107,7 +107,7 @@ typedef unsigned char XWRELAY_Cmd;
 #define HOST_ID_NONE   0
 #define HOST_ID_SERVER 1
 
-#define MAX_INVITE_LEN 15
+#define MAX_INVITE_LEN 31
 #define MAX_MSG_LEN    256      /* 100 is more like it */
 #define MAX_CONNNAME_LEN 48     /* host ID, boot time, and seeds as hex? */