diff --git a/modules/rtp_rtcp/source/rtp_sender.cc b/modules/rtp_rtcp/source/rtp_sender.cc
index 69a8203..1193068 100644
--- a/modules/rtp_rtcp/source/rtp_sender.cc
+++ b/modules/rtp_rtcp/source/rtp_sender.cc
@@ -484,8 +484,11 @@
         padding_packet->SetTimestamp(padding_packet->Timestamp() +
                                      (now_ms - last_timestamp_time_ms_) *
                                          kTimestampTicksPerMs);
-        padding_packet->set_capture_time_ms(padding_packet->capture_time_ms() +
-                                            (now_ms - last_timestamp_time_ms_));
+        if (padding_packet->capture_time_ms() > 0) {
+          padding_packet->set_capture_time_ms(
+              padding_packet->capture_time_ms() +
+              (now_ms - last_timestamp_time_ms_));
+        }
       }
       RTC_DCHECK(rtx_ssrc_);
       padding_packet->SetSsrc(*rtx_ssrc_);