diff --git a/classes/export/generate1.php b/classes/export/generate1.php
index 299f7e9..15ddef4 100755
--- a/classes/export/generate1.php
+++ b/classes/export/generate1.php
@@ -41,8 +41,8 @@
 $leader = ". . ";
 $timestamp = date("Ymdhis");
 
-
-exec("rm -rf ${work_dir}*");
+$rm_command = "rm -rf $work_dir" . "*";
+exec($rm_command);
 exec("mkdir -p $output_dir");