diff --git a/doc/Changelog b/doc/Changelog
index 777b34cd5..d3dcf4416 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -5,6 +5,7 @@
 	  cachedb lookup)
 	- allow storing a 0-TTL answer from cachedb in the in-memory message
 	  cache when serve-expired is yes
+	- Fix DNSCACHE_STORE_ZEROTTL to be bigger than 0xffff.
 
 18 September 2017: Ralph
 	- Fix #1400: allowing use of global cache on ECS-forwarding unless
diff --git a/services/cache/dns.h b/services/cache/dns.h
index bb1188e99..9e10f437f 100644
--- a/services/cache/dns.h
+++ b/services/cache/dns.h
@@ -53,7 +53,7 @@ struct delegpt;
  *  Must be an unsigned 32-bit value larger than 0xffff */
 
 /** Allow caching a DNS message with a zero TTL. */
-#define DNSCACHE_STORE_ZEROTTL 0x1000
+#define DNSCACHE_STORE_ZEROTTL 0x100000
 
 /**
  * Region allocated message reply