--- a/media/mtransport/test/ice_unittest.cpp
+++ b/media/mtransport/test/ice_unittest.cpp
@@ -922,17 +922,17 @@ class IceTestPeer : public sigslot::has_
       // we can get the corresponding stream on the remote side
       size_t index = -1;
       for (size_t i=0; i<ice_ctx_->GetStreamCount(); ++i) {
         if (ice_ctx_->GetStream(i) == stream) {
           index = i;
           break;
         }
       }
-      ASSERT_NE(index, -1);
+      ASSERT_NE(index, -1u);
 
       ASSERT_GT(remote_->ice_ctx_->GetStreamCount(), index);
       nsresult res = remote_->ice_ctx_->GetStream(index)->ParseTrickleCandidate(
           candidate);
       ASSERT_TRUE(NS_SUCCEEDED(res));
       ++trickled_;
     }
   }