diff --git a/src/routing_layer/topo_node_sqlite.c b/src/routing_layer/topo_node_sqlite.c
index d4e2629e..b95295e4 100644
--- a/src/routing_layer/topo_node_sqlite.c
+++ b/src/routing_layer/topo_node_sqlite.c
@@ -283,7 +283,7 @@ int topo_node_sqlite_member_block_put(sqlite3* db, const char* channel_id, uint6
                                        const char* userinfo, const uint8_t* creator_sig) {
     if (!db || !channel_id || !x25519_pubkey || !ed25519_pubkey) return -1;
     char peers_tbl[80]; peers_table_name(channel_id, peers_tbl, sizeof(peers_tbl));
-    char sql[512];
+    char sql[640];
     snprintf(sql, sizeof(sql),
         "INSERT INTO \"%s\"(node_id, x25519_pubkey, ed25519_pubkey,"
         " join_sig, join_ts, update_sig, update_ts, userinfo, creator_sig)"