diff --git a/software/apps/slave_node/prj.conf b/software/apps/slave_node/prj.conf
index 5eb038a..e141e40 100644
--- a/software/apps/slave_node/prj.conf
+++ b/software/apps/slave_node/prj.conf
@@ -27,3 +27,4 @@ CONFIG_SETTINGS_LOG_LEVEL_DBG=y
 CONFIG_UART_INTERRUPT_DRIVEN=y
 CONFIG_MODBUS=y
 CONFIG_MODBUS_ROLE_SERVER=y
+CONFIG_MODBUS_BUFFER_SIZE=256