diff --git a/cpp/src/Ice/Network.cpp b/cpp/src/Ice/Network.cpp
index e3ea91d..0f0e7ab 100644
--- a/cpp/src/Ice/Network.cpp
+++ b/cpp/src/Ice/Network.cpp
@@ -501,6 +501,7 @@ IceInternal::AsyncInfo::AsyncInfo(SocketOperation s)
 {
     ZeroMemory(this, sizeof(AsyncInfo));
     status = s;
+    count = 0;
 }
 #endif
 
diff --git a/cpp/src/Ice/TcpTransceiver.cpp b/cpp/src/Ice/TcpTransceiver.cpp
index bbaba2b..9036559 100644
--- a/cpp/src/Ice/TcpTransceiver.cpp
+++ b/cpp/src/Ice/TcpTransceiver.cpp
@@ -301,6 +301,7 @@ IceInternal::TcpTransceiver::startWrite(Buffer& buf)
         packetSize = _maxSendPacketSize;
     }
 
+    assert(_write.count == 0);
     _write.buf.len = packetSize;
     _write.buf.buf = reinterpret_cast<char*>(&*buf.i);
     int err = WSASend(_fd, &_write.buf, 1, &_write.count, 0, &_write, NULL);
@@ -367,6 +368,7 @@ IceInternal::TcpTransceiver::finishWrite(Buffer& buf)
     }
 
     buf.i += _write.count;
+    _write.count = 0;
 }
 
 void
@@ -380,6 +382,7 @@ IceInternal::TcpTransceiver::startRead(Buffer& buf)
 
     assert(!buf.b.empty() && buf.i != buf.b.end());
 
+    assert(_read.count == 0);
     _read.buf.len = packetSize;
     _read.buf.buf = reinterpret_cast<char*>(&*buf.i);
     int err = WSARecv(_fd, &_read.buf, 1, &_read.count, &_read.flags, &_read, NULL);
@@ -446,6 +449,7 @@ IceInternal::TcpTransceiver::finishRead(Buffer& buf)
     }
 
     buf.i += _read.count;
+    _read.count = 0;
 }
 #endif