diff --git a/meshtastic/mesh.options b/meshtastic/mesh.options
index ec1f766..35e4dc6 100644
--- a/meshtastic/mesh.options
+++ b/meshtastic/mesh.options
@@ -52,3 +52,5 @@
 *Waypoint.description  max_size:100
 
 *NeighborInfo.neighbors max_count:10
+
+*DeviceMetadata.firmware_version max_size:18
\ No newline at end of file