diff --git a/util/dns_resolve.cc b/util/dns_resolve.cc
index 63c937e9..e9522176 100644
--- a/util/dns_resolve.cc
+++ b/util/dns_resolve.cc
@@ -25,7 +25,7 @@ struct NotifyStruct {
   fibers_ext::EventCount evc;
 };
 
-static void DnsResolveNotify(__sigval_t val) {
+static void DnsResolveNotify(sigval_t val) {
   NotifyStruct* ns = (NotifyStruct*)val.sival_ptr;
   ns->gate.store(true, memory_order_relaxed);
   ns->evc.notify();