diff --git a/libsrc/cbm510/crt0.s b/libsrc/cbm510/crt0.s
index e89bae74f..16c75ba81 100644
--- a/libsrc/cbm510/crt0.s
+++ b/libsrc/cbm510/crt0.s
@@ -2,7 +2,7 @@
 ; Startup code for cc65 (CBM 500 version)
 ;
 
-   	.export	     	_exit
+   	.export	     	_exit, BRKVec
         .export         __STARTUP__ : absolute = 1      ; Mark as startup
 
      	.import	   	_clrscr, initlib, donelib, callirq_y