diff --git a/public-trunk/Transceiver/Transceiver.cpp b/public-trunk/Transceiver/Transceiver.cpp
index 77f9a3a..cef8b3d 100644
--- a/public-trunk/Transceiver/Transceiver.cpp
+++ b/public-trunk/Transceiver/Transceiver.cpp
@@ -301,6 +301,9 @@ SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime,
      double framesElapsed = rxBurst->time()-prevFalseDetectionTime;
      if (framesElapsed > 50) {  // if we haven't had any false detections for a while, lower threshold
 	mEnergyThreshold -= 10.0;
+       	if (mEnergyThreshold < 0.0)
+          mEnergyThreshold = 0.0;
+
         prevFalseDetectionTime = rxBurst->time();
      }
      delete rxBurst;
diff --git a/public-trunk/Transceiver52M/Transceiver.cpp b/public-trunk/Transceiver52M/Transceiver.cpp
index a80832a..914e8b5 100644
--- a/public-trunk/Transceiver52M/Transceiver.cpp
+++ b/public-trunk/Transceiver52M/Transceiver.cpp
@@ -303,6 +303,9 @@ SoftVector *Transceiver::pullRadioVector(GSM::Time &wTime,
      double framesElapsed = rxBurst->time()-prevFalseDetectionTime;
      if (framesElapsed > 50) {  // if we haven't had any false detections for a while, lower threshold
 	mEnergyThreshold -= 10.0/10.0;
+        if (mEnergyThreshold < 0.0)
+          mEnergyThreshold = 0.0;
+
         prevFalseDetectionTime = rxBurst->time();
      }
      delete rxBurst;