diff --git a/main_tools/ConfidenceMeasure.sh b/main_tools/ConfidenceMeasure.sh
index cd69ae1..9a7ac6f 100755
--- a/main_tools/ConfidenceMeasure.sh
+++ b/main_tools/ConfidenceMeasure.sh
@@ -102,7 +102,7 @@ mkdir -p $GVCTM > /dev/null 2>&1
 mkdir -p $SEGCTM > /dev/null 2>&1
 mkdir -p $SUPER_CTM > /dev/null 2>&1
 mkdir -p $SCORED_CTM > /dev/null 2>&1
-if [ -z $BOOST_BIN ] && [ $ARCH == ".64" ] ; then
+if [ -z $BOOST_BIN ] && [ "$ARCH" == ".64" ] ; then
 	BOOST_BIN=$ROOT/bin/icsiboost-64bit-static-r160	
 fi
 if [ -z $BOOST_BIN ] ; then