diff --git a/CalibCalorimetry/CaloTPG/src/CaloTPGTranscoderULUT.cc b/CalibCalorimetry/CaloTPG/src/CaloTPGTranscoderULUT.cc
index b23cb447be2c7..649b43bf3b70d 100644
--- a/CalibCalorimetry/CaloTPG/src/CaloTPGTranscoderULUT.cc
+++ b/CalibCalorimetry/CaloTPG/src/CaloTPGTranscoderULUT.cc
@@ -124,7 +124,7 @@ HcalTriggerPrimitiveSample CaloTPGTranscoderULUT::hcalCompress(const HcalTrigTow
 
   if (sample >= getOutputLUTSize(id))
     throw cms::Exception("Out of Range")
-       << "LUT has " << getOutputLUTSize(id) << " entries for " << itower << " but " << sample << " was requested.";
+       << "LUT has " << getOutputLUTSize(id) << " entries for " << id << " but " << sample << " was requested.";
 
   if(itower >= outputLUT_.size())
     throw cms::Exception("Out of Range") << "No decompression LUT found for " << id;