diff --git a/components/freemodbus/Kconfig b/components/freemodbus/Kconfig
index b6d3d29..2ed7ee3 100644
--- a/components/freemodbus/Kconfig
+++ b/components/freemodbus/Kconfig
@@ -22,7 +22,7 @@ config MB_SERIAL_BUF_SIZE
     default 256
     help
         Modbus serial task RX and TX buffer size for UART driver initialization.
-        This buffer is used for modbus frame transfer. The Modbus protocol maximum 
+        This buffer is used for Modbus frame transfer. The Modbus protocol maximum 
         frame size is 256 bytes. Bigger size can be used for non standard implementations.
         
 config MB_SERIAL_TASK_PRIO
diff --git a/components/freemodbus/modbus_controller/mbcontroller.h b/components/freemodbus/modbus_controller/mbcontroller.h
index b6b206e..267fa34 100644
--- a/components/freemodbus/modbus_controller/mbcontroller.h
+++ b/components/freemodbus/modbus_controller/mbcontroller.h
@@ -26,7 +26,7 @@
 
 /* ----------------------- Defines ------------------------------------------*/
 #define MB_INST_MIN_SIZE                    (2) // The minimal size of Modbus registers area in bytes
-#define MB_INST_MAX_SIZE                    (2048) // The maximum size of Modbus area in bytes
+#define MB_INST_MAX_SIZE                    (65535 * 2) // The maximum size of Modbus area in bytes
 
 #define MB_CONTROLLER_STACK_SIZE            (CONFIG_MB_CONTROLLER_STACK_SIZE) // Stack size for Modbus controller
 #define MB_CONTROLLER_PRIORITY              (CONFIG_MB_SERIAL_TASK_PRIO - 1) // priority of MB controller task