--- a/netwerk/streamconv/converters/nsBinHexDecoder.cpp
+++ b/netwerk/streamconv/converters/nsBinHexDecoder.cpp
@@ -25,16 +25,18 @@ namespace net {
 
 nsBinHexDecoder::nsBinHexDecoder() :
   mState(0), mCRC(0), mFileCRC(0), mOctetin(26),
   mDonePos(3), mInCRC(0), mCount(0), mMarker(0), mPosInbuff(0),
   mPosOutputBuff(0)
 {
   mDataBuffer = nullptr;
   mOutgoingBuffer = nullptr;
+  mPosInDataBuffer = 0;
+  mRlebuf = 0;
 
   mOctetBuf.val = 0;
   mHeader.type = 0;
   mHeader.creator = 0;
   mHeader.flags = 0;
   mHeader.dlen = 0;
   mHeader.rlen = 0;
 }