diff --git a/debian/resources/fusionpbx.sh b/debian/resources/fusionpbx.sh
index ec76671..20c2660 100755
--- a/debian/resources/fusionpbx.sh
+++ b/debian/resources/fusionpbx.sh
@@ -14,18 +14,18 @@ verbose "Installing FusionPBX"
 apt-get install -y --force-yes vim git dbus haveged ssl-cert
 apt-get install -y --force-yes ghostscript libtiff5-dev libtiff-tools
 
-if [ .$USE_SYSTEM_MASTER = .true ]; then
+if [ .$system_branch = "master" ]; then
 	verbose "Using master"
-	BRANCH=""
+	branch=""
 else
-	FUSION_MAJOR=$(git ls-remote --heads https://github.com/fusionpbx/fusionpbx.git | cut -d/ -f 3 | grep -P '^\d+\.\d+' | sort | tail -n 1 | cut -d. -f1)
-	FUSION_MINOR=$(git ls-remote --tags https://github.com/fusionpbx/fusionpbx.git $FUSION_MAJOR.* | cut -d/ -f3 |  grep -P '^\d+\.\d+' | sort | tail -n 1 | cut -d. -f2)
-	FUSION_VERSION=$FUSION_MAJOR.$FUSION_MINOR
-	verbose "Using version $FUSION_VERSION"
-	BRANCH="-b $FUSION_VERSION"
+	system_major=$(git ls-remote --heads https://github.com/fusionpbx/fusionpbx.git | cut -d/ -f 3 | grep -P '^\d+\.\d+' | sort | tail -n 1 | cut -d. -f1)
+	system_minor=$(git ls-remote --tags https://github.com/fusionpbx/fusionpbx.git $system_major.* | cut -d/ -f3 |  grep -P '^\d+\.\d+' | sort | tail -n 1 | cut -d. -f2)
+	system_version=$system_major.$system_minor
+	verbose "Using version $system_version"
+	branch="-b $system_version"
 fi
 
 #get the source code
-git clone $BRANCH https://github.com/fusionpbx/fusionpbx.git /var/www/fusionpbx
+git clone $branch https://github.com/fusionpbx/fusionpbx.git /var/www/fusionpbx
 chown -R www-data:www-data /var/www/fusionpbx
 chmod -R 755 /var/www/fusionpbx/secure