--- a/media/webrtc/signaling/gtest/jsep_session_unittest.cpp
+++ b/media/webrtc/signaling/gtest/jsep_session_unittest.cpp
@@ -562,16 +562,21 @@ protected:
           std::string msidAttr("a=msid:");
           msidAttr += tracks[i]->GetStreamId();
           msidAttr += " ";
           msidAttr += tracks[i]->GetTrackId();
           ASSERT_NE(std::string::npos, offer.find(msidAttr))
             << "Did not find " << msidAttr << " in offer";
         }
       }
+      if (types.size() == 1 &&
+          tracks[0]->GetMediaType() == SdpMediaSection::kApplication) {
+        ASSERT_EQ(std::string::npos, offer.find("a=ssrc"))
+          << "Data channel should not contain SSRC";
+      }
     }
   }
 
   void
   SetRemoteOffer(const std::string& offer, uint32_t checkFlags = ALL_CHECKS)
   {
     nsresult rv = mSessionAns.SetRemoteDescription(kJsepSdpOffer, offer);
 
@@ -627,16 +632,21 @@ protected:
           std::string msidAttr("a=msid:");
           msidAttr += pairs[i].mSending->GetStreamId();
           msidAttr += " ";
           msidAttr += pairs[i].mSending->GetTrackId();
           ASSERT_NE(std::string::npos, answer.find(msidAttr))
             << "Did not find " << msidAttr << " in offer";
         }
       }
+      if (types.size() == 1 &&
+          pairs[0].mReceiving->GetMediaType() == SdpMediaSection::kApplication) {
+        ASSERT_EQ(std::string::npos, answer.find("a=ssrc"))
+          << "Data channel should not contain SSRC";
+      }
     }
     std::cerr << "OFFER pairs:" << std::endl;
     DumpTrackPairs(mSessionOff);
   }
 
   void
   SetRemoteAnswer(const std::string& answer, uint32_t checkFlags = ALL_CHECKS)
   {