diff --git a/mach/m68k2/cg/mach.h b/mach/m68k2/cg/mach.h
index d2db72fff..8a385ffb8 100644
--- a/mach/m68k2/cg/mach.h
+++ b/mach/m68k2/cg/mach.h
@@ -1,3 +1,4 @@
+#define ex_ap(y)	fprintf(codefile,".extern %s\n", y)
 #define in_ap(y)	/* nothing */
 
 #define newilb(x)	fprintf(codefile,"%s:\n",x)