diff --git a/libsrc/cbm510/crt0.s b/libsrc/cbm510/crt0.s
index b304c32c7..6500397ae 100644
--- a/libsrc/cbm510/crt0.s
+++ b/libsrc/cbm510/crt0.s
@@ -5,6 +5,9 @@
 ;
 
    	.export	     	_exit
+	.exportzp       vic, sid, cia1, cia2, acia, tpi1, tpi2, ktab1
+	.exportzp       ktab2, ktab3, ktab4, time, RecvBuf, SendBuf
+
      	.import	   	_clrscr, initlib, donelib
      	.import	     	push0, _main
 	.import	   	__CHARRAM_START__, __CHARRAM_SIZE__, __VIDRAM_START__
diff --git a/libsrc/cbm610/crt0.s b/libsrc/cbm610/crt0.s
index 9c5769521..c13bcb043 100644
--- a/libsrc/cbm610/crt0.s
+++ b/libsrc/cbm610/crt0.s
@@ -5,6 +5,9 @@
 ;
 
 	.export	     	_exit
+	.exportzp       crtc, sid, IPCcia, cia, acia, tpi1, tpi2, ktab1
+	.exportzp       ktab2, ktab3, ktab4, time, RecvBuf, SendBuf
+
 	.import		initlib, donelib
 	.import	     	push0, _main
 	.import	       	__BSS_RUN__, __BSS_SIZE__