--- ./net/dns/dns_reloader.cc.orig
+++ ./net/dns/dns_reloader.cc
@@ -4,8 +4,7 @@
 
 #include "net/dns/dns_reloader.h"
 
-#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_OPENBSD) && \
-    !defined(OS_ANDROID) && !defined(OS_FUCHSIA)
+#if defined(__GLIBC__)
 
 #include <resolv.h>
 
--- ./net/dns/host_resolver_proc.cc.orig
+++ ./net/dns/host_resolver_proc.cc
@@ -190,8 +190,7 @@
   // Restrict result set to only this socket type to avoid duplicates.
   hints.ai_socktype = SOCK_STREAM;
 
-#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_OPENBSD) && \
-    !defined(OS_ANDROID) && !defined(OS_FUCHSIA)
+#if defined(__GLIBC__)
   DnsReloaderMaybeReload();
 #endif
   int err = getaddrinfo(host.c_str(), NULL, &hints, &ai);
diff --git a/net/dns/host_resolver_impl.cc b/net/dns/host_resolver_impl.cc
index bdf16b8..b234edd 100644
--- ./net/dns/host_resolver_impl.cc
+++ ./net/dns/host_resolver_impl.cc
@@ -2018,8 +2018,7 @@ HostResolverImpl::HostResolverImpl(const Options& options, NetLog* net_log)
   NetworkChangeNotifier::AddIPAddressObserver(this);
   NetworkChangeNotifier::AddConnectionTypeObserver(this);
   NetworkChangeNotifier::AddDNSObserver(this);
-#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_OPENBSD) && \
-    !defined(OS_ANDROID)
+#if defined(__GLIBC__)
   EnsureDnsReloaderInit();
 #endif