diff --git a/src_main/io_utils/piconnection.cpp b/src_main/io_utils/piconnection.cpp
index 575d90ef..63d24ef1 100644
--- a/src_main/io_utils/piconnection.cpp
+++ b/src_main/io_utils/piconnection.cpp
@@ -1119,13 +1119,14 @@ void PIConnection::DevicePool::run() {
 void __DevicePool_threadReadDP(void * ddp) {
 	PIConnection::DevicePool::DeviceData * dd((PIConnection::DevicePool::DeviceData * )ddp);
 	if (dd->dev == 0) {piMSleep(100); return;}
-	if (dd->dev->isClosed())
-		if (!dd->dev->open()) {piMSleep(dd->dev->reopenTimeout()); return;}
+	PIIODevice * dev = dd->dev;
+	if (dev->isClosed())
+		if (!dev->open()) {piMSleep(dev->reopenTimeout()); return;}
 	PIByteArray ba;
-	ba = dd->dev->read(dd->dev->threadedReadBufferSize());
+	ba = dev->read(dev->threadedReadBufferSize());
 //	dd->dev->threadedRead(ba.data(), ba.size());
 	if (ba.isEmpty()) {piMSleep(10); return;}
-	dd->dev->threadedRead(ba.data(), ba.size_s());
+	dev->threadedRead(ba.data(), ba.size_s());
 	//piCout << "Readed from" << dd->dev->path() << Hex << ba;
 	__device_pool__->deviceReaded(dd, ba);
 }