diff --git a/rtc_base/BUILD.gn b/rtc_base/BUILD.gn
index fdc2adf639..419128d89d 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -940,6 +940,7 @@ rtc_library("async_dns_resolver") {
     "../api:make_ref_counted",
     "../api:sequence_checker",
     "../api/task_queue:pending_task_safety_flag",
+    "system:rtc_export",
   ]
 }
 
diff --git a/rtc_base/async_dns_resolver.h b/rtc_base/async_dns_resolver.h
index c15af7a1cb..288751efa4 100644
--- a/rtc_base/async_dns_resolver.h
+++ b/rtc_base/async_dns_resolver.h
@@ -16,6 +16,7 @@
 #include "api/sequence_checker.h"
 #include "api/task_queue/pending_task_safety_flag.h"
 #include "rtc_base/ref_counted_object.h"
+#include "rtc_base/system/rtc_export.h"
 #include "rtc_base/thread_annotations.h"
 
 namespace webrtc {
@@ -37,7 +38,7 @@ class AsyncDnsResolverResultImpl : public AsyncDnsResolverResult {
   int error_ RTC_GUARDED_BY(sequence_checker_);
 };
 
-class AsyncDnsResolver : public AsyncDnsResolverInterface {
+class RTC_EXPORT AsyncDnsResolver : public AsyncDnsResolverInterface {
  public:
   AsyncDnsResolver();
   ~AsyncDnsResolver();