diff --git a/azbox/dmx.cpp b/azbox/dmx.cpp
index 1353cfd..80d500a 100644
--- a/azbox/dmx.cpp
+++ b/azbox/dmx.cpp
@@ -95,6 +95,10 @@ bool cDemux::Open(DMX_CHANNEL_TYPE pes_type, void * /*hVideoBuffer*/, int uBuffe
 	int flags = O_RDWR;
 	if (fd > -1)
 		lt_info("%s FD ALREADY OPENED? fd = %d\n", __FUNCTION__, fd);
+
+	if (pes_type != DMX_PSI_CHANNEL)
+		flags |= O_NONBLOCK;
+
 	fd = open(devname[devnum], flags);
 	if (fd < 0)
 	{
diff --git a/libspark/dmx.cpp b/libspark/dmx.cpp
index 188fd5f..bc5c0c2 100644
--- a/libspark/dmx.cpp
+++ b/libspark/dmx.cpp
@@ -94,6 +94,9 @@ bool cDemux::Open(DMX_CHANNEL_TYPE pes_type, void * /*hVideoBuffer*/, int uBuffe
 	int flags = O_RDWR;
 	if (fd > -1)
 		lt_info("%s FD ALREADY OPENED? fd = %d\n", __FUNCTION__, fd);
+
+	if (pes_type != DMX_PSI_CHANNEL)
+		flags |= O_NONBLOCK;
 #if 0
 	if (pes_type == DMX_TP_CHANNEL)
 	{