--- ./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>
 
--- ./net/dns/host_resolver_manager.cc
+++ ./net/dns/host_resolver_manager.cc
@@ -2747,8 +2747,7 @@
   NetworkChangeNotifier::AddConnectionTypeObserver(this);
   if (system_dns_config_notifier_)
     system_dns_config_notifier_->AddObserver(this);
-#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_OPENBSD) && \
-    !defined(OS_ANDROID)
+#if defined(OS_POSIX) && defined(__GLIBC__)
   EnsureDnsReloaderInit();
 #endif
 
--- ./net/dns/host_resolver_proc.cc
+++ ./net/dns/host_resolver_proc.cc
@@ -159,8 +159,7 @@
   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
   base::Optional<AddressInfo> ai;