diff --git a/avr/devices/c02/main/main.asm b/avr/devices/c02/main/main.asm
index ce136d1..b2ffe22 100644
--- a/avr/devices/c02/main/main.asm
+++ b/avr/devices/c02/main/main.asm
@@ -33,6 +33,8 @@
 ; ---------------------------------------------------------------------------
 ; generic
 
+.equ STACK_SIZE                   = 128
+
 .equ NET_BUFFERS_NUM              = 8
 .equ NET_BUFFERS_SIZE             = 32
 
@@ -228,6 +230,7 @@ onEveryLoop:
 .include "modules/lcd2/font/font12x20.asm"
 ;.include "common/list_t.asm"
 .include "common/tree_t.asm"
+.include "common/divide.asm"
 
 
 ; ---------------------------------------------------------------------------
@@ -443,5 +446,5 @@ heapStart:
 
 
 .equ HEAP_START = heapStart
-.equ HEAP_SIZE  = SRAM_SIZE-HEAP_START
+.equ HEAP_SIZE  = (SRAM_SIZE-STACK_SIZE)-HEAP_START