diff --git a/src/zone.c b/src/zone.c
index 23dfdd04..72abf000 100644
--- a/src/zone.c
+++ b/src/zone.c
@@ -434,6 +434,7 @@ zone_promote(void) {
 }
 
 JEMALLOC_ATTR(constructor)
+JEMALLOC_ATTR(used)
 void
 zone_register(void) {
 	/*