--- a/media/webrtc/signaling/src/jsep/JsepSessionImpl.cpp
+++ b/media/webrtc/signaling/src/jsep/JsepSessionImpl.cpp
@@ -636,17 +636,18 @@ JsepSessionImpl::SetupBundle(Sdp* sdp) c
   std::vector<std::string> mids;
   std::set<SdpMediaSection::MediaType> observedTypes;
 
   // This has the effect of changing the bundle level if the first m-section
   // goes from disabled to enabled. This is kinda inefficient.
 
   for (size_t i = 0; i < sdp->GetMediaSectionCount(); ++i) {
     auto& attrs = sdp->GetMediaSection(i).GetAttributeList();
-    if (attrs.HasAttribute(SdpAttribute::kMidAttribute)) {
+    if ((sdp->GetMediaSection(i).GetPort() != 0) &&
+        attrs.HasAttribute(SdpAttribute::kMidAttribute)) {
       bool useBundleOnly = false;
       switch (mBundlePolicy) {
         case kBundleMaxCompat:
           // We don't use bundle-only for max-compat
           break;
         case kBundleBalanced:
           // balanced means we use bundle-only on everything but the first
           // m-section of a given type