diff --git a/kernel/trunk/network/stack.inc b/kernel/trunk/network/stack.inc
index 264e97b3f1..5d30b41bcc 100644
--- a/kernel/trunk/network/stack.inc
+++ b/kernel/trunk/network/stack.inc
@@ -618,7 +618,7 @@ checksum_2:
 align 4
 sys_network:
 
-        cmp     ebx, -1
+        cmp     bl, 255
         jne     @f
 
         mov     eax, [NET_RUNNING]