diff --git a/doc/Changelog b/doc/Changelog
index 907197492..2dcaa4650 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -1,5 +1,6 @@
 29 September 2016: Wouter
 	- Fix #838: 1.5.10 cannot be built on Solaris, undefined PATH_MAX.
+	- Fix #839: Memory grows unexpectedly with large RPZ files.
 
 27 September 2016: Wouter
 	- tag for 1.5.10 release
diff --git a/services/localzone.c b/services/localzone.c
index 3268477d7..6446e3f26 100644
--- a/services/localzone.c
+++ b/services/localzone.c
@@ -154,7 +154,7 @@ local_zone_create(uint8_t* nm, size_t len, int labs,
 	z->namelen = len;
 	z->namelabs = labs;
 	lock_rw_init(&z->lock);
-	z->region = regional_create();
+	z->region = regional_create_custom(sizeof(struct regional));
 	if(!z->region) {
 		free(z);
 		return NULL;