diff --git a/GSM/GSMLogicalChannel.cpp b/GSM/GSMLogicalChannel.cpp
index f3a04c0..e8dc4a2 100644
--- a/GSM/GSMLogicalChannel.cpp
+++ b/GSM/GSMLogicalChannel.cpp
@@ -124,13 +124,13 @@ void CCCHLogicalChannel::serviceLoop()
 	LogicalChannel::send(idleFrame);
 	// run the loop
 	while (true) {
-		L3Frame* frame = mQ.read();
+		L3Frame* frame = mQ.readNoBlock();
 		if (frame) {
 			LogicalChannel::send(*frame);
 			OBJLOG(DEBUG) << "CCCHLogicalChannel::serviceLoop sending " << *frame;
 			delete frame;
 		}
-		if (mQ.size()==0) {
+		else {
 			LogicalChannel::send(idleFrame);
 			OBJLOG(DEBUG) << "CCCHLogicalChannel::serviceLoop sending idle frame";
 		}