diff --git a/installers/common.sh b/installers/common.sh
index 740f263b..4457ea24 100755
--- a/installers/common.sh
+++ b/installers/common.sh
@@ -577,12 +577,13 @@ function _download_latest_files() {
     if [ -d "$webroot_dir" ] && [ "$update" == 0 ]; then
         sudo mv $webroot_dir "$webroot_dir.`date +%F-%R`" || _install_status 1 "Unable to move existing webroot directory"
     elif [ "$upgrade" == 1 ] || [ "$update" == 1 ]; then
+        exclude='--exclude=ajax/system/sys_read_logfile.php'
         shopt -s extglob
         sudo find "$webroot_dir" ! -path "${webroot_dir}/ajax/system/sys_read_logfile.php" -delete 2>/dev/null
     fi
 
     _install_log "Installing application to $webroot_dir"
-    sudo rsync -av --exclude='ajax/system/sys_read_logfile.php' "$source_dir"/ "$webroot_dir"/ >/dev/null 2>&1 || _install_status 1 "Unable to install files to $webroot_dir"
+    sudo rsync -av $exclude "$source_dir"/ "$webroot_dir"/ >/dev/null 2>&1 || _install_status 1 "Unable to install files to $webroot_dir"
 
     if [ "$update" == 1 ]; then
         _install_log "Applying existing configuration to ${webroot_dir}/includes"