diff --git a/cfg/atari7800.cfg b/cfg/atari7800.cfg
index a2aa7b36c..cf663be3d 100644
--- a/cfg/atari7800.cfg
+++ b/cfg/atari7800.cfg
@@ -25,6 +25,7 @@ MEMORY {
 SEGMENTS {
     ZEROPAGE:   load = ZP,              type = zp;
     STARTUP:    load = ROM,             type = ro,  define = yes;
+    ONCE:       load = ROM,             type = ro,  define = yes;
     CODE:       load = ROM,             type = ro,  define = yes;
     RODATA:     load = ROM,             type = ro,  define = yes, align = 256;
     DATA:       load = ROM, run = RAM1, type = rw,  define = yes;