diff --git a/tools/valgrind-webrtc/drmemory/suppressions.txt b/tools/valgrind-webrtc/drmemory/suppressions.txt
index 90831d1a9..e76a8e850 100644
--- a/tools/valgrind-webrtc/drmemory/suppressions.txt
+++ b/tools/valgrind-webrtc/drmemory/suppressions.txt
@@ -858,62 +858,6 @@ name=https://code.google.com/p/webrtc/issues/detail?id=3184 (7)
 *!webrtc::MouseCursorMonitorTest_ShapeOnly_Test::TestBody
 *!testing::internal::HandleSehExceptionsInMethodIfSupported<>
 
-UNINITIALIZED READ
-name=https://code.google.com/p/webrtc/issues/detail?id=3183 (1)
-*!webrtc::RTPReceiverVideo::ReceiveGenericCodec
-*!webrtc::RTPReceiverVideo::ParseVideoCodecSpecific
-*!webrtc::RTPReceiverVideo::ParseRtpPacket
-*!webrtc::RtpReceiverImpl::IncomingRtpPacket
-*!RtxLoopBackTransport::SendPacket
-*!webrtc::RTPSender::SendPacketToNetwork
-*!webrtc::RTPSender::SendToNetwork
-*!webrtc::RTPSenderVideo::SendVideoPacket
-*!webrtc::RTPSenderVideo::SendGeneric
-*!webrtc::RTPSenderVideo::SendVideo
-*!webrtc::RTPSender::SendOutgoingData
-*!webrtc::ModuleRtpRtcpImpl::SendOutgoingData
-*!RtpRtcpRtxNackTest_LongNackList_Test::TestBody
-*!testing::internal::HandleSehExceptionsInMethodIfSupported<>
-
-UNINITIALIZED READ
-name=name=https://code.google.com/p/webrtc/issues/detail?id=3183 (2)
-*!webrtc::RTPReceiverVideo::ReceiveGenericCodec
-*!webrtc::RTPReceiverVideo::ParseVideoCodecSpecific
-*!webrtc::RTPReceiverVideo::ParseRtpPacket
-*!webrtc::RtpReceiverImpl::IncomingRtpPacket
-*!RtxLoopBackTransport::SendPacket
-*!webrtc::RTPSender::SendPacketToNetwork
-*!webrtc::RTPSender::PrepareAndSendPacket
-*!webrtc::RTPSender::ReSendPacket
-*!webrtc::RTPSender::OnReceivedNACK
-*!webrtc::ModuleRtpRtcpImpl::OnReceivedNACK
-*!webrtc::RTCPReceiver::TriggerCallbacksFromRTCPPacket
-*!webrtc::ModuleRtpRtcpImpl::IncomingRtcpPacket
-*!RtxLoopBackTransport::SendRTCPPacket
-*!webrtc::RTCPSender::SendToNetwork
-*!webrtc::RTCPSender::SendRTCP
-*!webrtc::ModuleRtpRtcpImpl::SendNACK
-*!RtpRtcpRtxNackTest_LongNackList_Test::TestBody
-*!testing::internal::HandleSehExceptionsInMethodIfSupported<>
-
-UNINITIALIZED READ
-name=name=https://code.google.com/p/webrtc/issues/detail?id=3183 (3)
-*!webrtc::RTPReceiverVideo::ReceiveGenericCodec
-*!webrtc::RTPReceiverVideo::ParseVideoCodecSpecific
-*!webrtc::RTPReceiverVideo::ParseRtpPacket
-*!webrtc::RtpReceiverImpl::IncomingRtpPacket
-*!RtxLoopBackTransport::SendPacket
-*!webrtc::RTPSender::SendPacketToNetwork
-*!webrtc::RTPSender::SendToNetwork
-*!webrtc::RTPSenderVideo::SendVideoPacket
-*!webrtc::RTPSenderVideo::SendGeneric
-*!webrtc::RTPSenderVideo::SendVideo
-*!webrtc::RTPSender::SendOutgoingData
-*!webrtc::ModuleRtpRtcpImpl::SendOutgoingData
-*!RtpRtcpRtxNackTest::RunRtxTest
-*!RtpRtcpRtxNackTest_RtxNack_Test::TestBody
-*!testing::internal::HandleSehExceptionsInMethodIfSupported<>
-
 UNINITIALIZED READ
 name=https://code.google.com/p/webrtc/issues/detail?id=3490 (1)
 drmemorylib.dll!replace_memcmp
diff --git a/webrtc/modules/rtp_rtcp/source/nack_rtx_unittest.cc b/webrtc/modules/rtp_rtcp/source/nack_rtx_unittest.cc
index 209af40bc..b30791c6d 100644
--- a/webrtc/modules/rtp_rtcp/source/nack_rtx_unittest.cc
+++ b/webrtc/modules/rtp_rtcp/source/nack_rtx_unittest.cc
@@ -112,7 +112,10 @@ class RtxLoopBackTransport : public webrtc::Transport {
       return len;
     }
     int packet_length = len;
-    uint8_t restored_packet[1500];
+    // TODO(pbos): Figure out why this needs to be initialized. Likely this
+    // is hiding a bug either in test setup or other code.
+    // https://code.google.com/p/webrtc/issues/detail?id=3183
+    uint8_t restored_packet[1500] = {0};
     uint8_t* restored_packet_ptr = restored_packet;
     RTPHeader header;
     scoped_ptr<RtpHeaderParser> parser(RtpHeaderParser::Create());