diff --git a/lib/dns/include/dns/rdataslab.h b/lib/dns/include/dns/rdataslab.h
index 7364b8d644..10a8525a1f 100644
--- a/lib/dns/include/dns/rdataslab.h
+++ b/lib/dns/include/dns/rdataslab.h
@@ -53,12 +53,6 @@ ISC_LANG_BEGINDECLS
 #define DNS_RDATASLAB_EXACT 0x2
 
 #define DNS_RDATASLAB_OFFLINE 0x01 /* RRSIG is for offline DNSKEY */
-#define DNS_RDATASLAB_WARNMASK          \
-	0x0E /*%< RRSIG(DNSKEY) expired \
-	      * warnings number mask. */
-#define DNS_RDATASLAB_WARNSHIFT               \
-	1 /*%< How many bits to shift to find \
-	   * remaining expired warning number. */
 
 /***
  *** Functions