diff --git a/mach/i86/libsys/head_em.s b/mach/i86/libsys/head_em.s
index fd45fde90..d421e79b8 100644
--- a/mach/i86/libsys/head_em.s
+++ b/mach/i86/libsys/head_em.s
@@ -1,6 +1,6 @@
 .define begtext,begdata,begbss
 .define hol0,.reghp,.limhp,.trppc,.ignmask
-.define ERANGE,ESET,EHEAP,ECASE,EILLINS
+.define ERANGE,ESET,EHEAP,ECASE,EILLINS,EODDZ
 
 ERANGE          = 1
 ESET            = 2