diff --git a/net/dns/dns_reloader.cc b/net/dns/dns_reloader.cc
index 03e248c..1a7b237 100644
--- ./net/dns/dns_reloader.cc
+++ ./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>
 
diff --git a/net/dns/host_resolver_manager.cc b/net/dns/host_resolver_manager.cc
index 3c75dde..c748d94 100644
--- ./net/dns/host_resolver_manager.cc
+++ ./net/dns/host_resolver_manager.cc
@@ -2266,8 +2266,7 @@ HostResolverManager::HostResolverManager(const Options& options,
   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
 
diff --git a/net/dns/host_resolver_proc.cc b/net/dns/host_resolver_proc.cc
index 90d9958..71d9b4a 100644
--- ./net/dns/host_resolver_proc.cc
+++ ./net/dns/host_resolver_proc.cc
@@ -197,8 +197,7 @@ int SystemHostResolverCall(const std::string& host,
   base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
                                                 base::BlockingType::WILL_BLOCK);
 
-#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(), nullptr, &hints, &ai);