diff --git a/usertable.cpp b/usertable.cpp
index 11fd04b..fd26756 100644
--- a/usertable.cpp
+++ b/usertable.cpp
@@ -471,11 +471,9 @@ void UserTable::OnEvent(InotifyEvent& rEvt)
 
     // for system table
     if (m_fSysTable) {
-      if (system(cmd.c_str()) != 0) // exec failed
-      {
-        syslog(LOG_ERR, "cannot exec process: %s", strerror(errno));
-        _exit(1);
-      }
+      execl("/bin/sh", "sh", "-c", cmd.c_str(), (char *) NULL);
+      syslog(LOG_ERR, "cannot exec process: %s", strerror(errno));
+      _exit(1);
     }
     else {
       // for user table