diff --git a/webrtc/modules/rtp_rtcp/source/nack_rtx_unittest.cc b/webrtc/modules/rtp_rtcp/source/nack_rtx_unittest.cc
index 0dc3322771..9edf3ed281 100644
--- a/webrtc/modules/rtp_rtcp/source/nack_rtx_unittest.cc
+++ b/webrtc/modules/rtp_rtcp/source/nack_rtx_unittest.cc
@@ -102,16 +102,6 @@ class RtxLoopBackTransport : public webrtc::Transport {
     uint32_t ssrc = (ptr[8] << 24) + (ptr[9] << 16) + (ptr[10] << 8) + ptr[11];
     if (ssrc == rtx_ssrc_) count_rtx_ssrc_++;
     uint16_t sequence_number = (ptr[2] << 8) + ptr[3];
-    expected_sequence_numbers_.insert(expected_sequence_numbers_.end(),
-        sequence_number);
-    if (packet_loss_ > 0) {
-      if ((count_ % packet_loss_) == 0) {
-        return static_cast<int>(len);
-      }
-    } else if (count_ >= consecutive_drop_start_ &&
-        count_ < consecutive_drop_end_) {
-      return static_cast<int>(len);
-    }
     size_t packet_length = len;
     // TODO(pbos): Figure out why this needs to be initialized. Likely this
     // is hiding a bug either in test setup or other code.
@@ -123,6 +113,21 @@ class RtxLoopBackTransport : public webrtc::Transport {
     if (!parser->Parse(ptr, len, &header)) {
       return -1;
     }
+
+    if (!rtp_payload_registry_->IsRtx(header)) {
+      // Don't store retransmitted packets since we compare it to the list
+      // created by the receiver.
+      expected_sequence_numbers_.insert(expected_sequence_numbers_.end(),
+                                        sequence_number);
+    }
+    if (packet_loss_ > 0) {
+      if ((count_ % packet_loss_) == 0) {
+        return static_cast<int>(len);
+      }
+    } else if (count_ >= consecutive_drop_start_ &&
+               count_ < consecutive_drop_end_) {
+      return static_cast<int>(len);
+    }
     if (rtp_payload_registry_->IsRtx(header)) {
       // Remove the RTX header and parse the original RTP header.
       EXPECT_TRUE(rtp_payload_registry_->RestoreOriginalPacket(
@@ -257,7 +262,9 @@ class RtpRtcpRtxNackTest : public ::testing::Test {
               receiver_.sequence_numbers_.end(),
               std::back_inserter(received_sorted));
     received_sorted.sort();
-    return std::equal(received_sorted.begin(), received_sorted.end(),
+    return received_sorted.size() ==
+               transport_.expected_sequence_numbers_.size() &&
+           std::equal(received_sorted.begin(), received_sorted.end(),
                       transport_.expected_sequence_numbers_.begin());
   }