diff --git a/rtc_base/async_resolver_interface.h b/rtc_base/async_resolver_interface.h
index 998ebd800d..829dc7e23b 100644
--- a/rtc_base/async_resolver_interface.h
+++ b/rtc_base/async_resolver_interface.h
@@ -27,11 +27,7 @@ class RTC_EXPORT AsyncResolverInterface {
   // Start address resolution of the hostname in `addr`.
   virtual void Start(const SocketAddress& addr) = 0;
   // Start address resolution of the hostname in `addr` matching `family`.
-  virtual void Start(const SocketAddress& addr, int family) {
-    // TODO(webrtc:14319) make pure virtual when all subclasses have been
-    // updated.
-    RTC_DCHECK_NOTREACHED();
-  }
+  virtual void Start(const SocketAddress& addr, int family) = 0;
   // Returns true iff the address from `Start` was successfully resolved.
   // If the address was successfully resolved, sets `addr` to a copy of the
   // address from `Start` with the IP address set to the top most resolved