diff --git a/pc/jsep_transport.h b/pc/jsep_transport.h
index 479c0ae6af..65800270ab 100644
--- a/pc/jsep_transport.h
+++ b/pc/jsep_transport.h
@@ -317,6 +317,7 @@ class JsepTransport : public sigslot::has_slots<>,
     } else if (unencrypted_rtp_transport_) {
       return unencrypted_rtp_transport_.get();
     } else {
+      RTC_DCHECK(media_transport_);
       return nullptr;
     }
   }