diff --git a/Transceiver52M/sigProcLib.cpp b/Transceiver52M/sigProcLib.cpp
index 4bb41a9..c09047b 100644
--- a/Transceiver52M/sigProcLib.cpp
+++ b/Transceiver52M/sigProcLib.cpp
@@ -1712,7 +1712,7 @@
 
   signalVector::const_iterator windowItr = rxBurst.begin(); //+rxBurst.size()/2 - 5*windowLength/2;
   float energy = 0.0;
-  if (windowLength < 0) windowLength = 20;
+  if (windowLength == 0) return 0.0;
   if (windowLength > rxBurst.size()) windowLength = rxBurst.size();
   for (unsigned i = 0; i < windowLength; i++) {
     energy += windowItr->norm2();