diff --git a/lxsession/lxsession-logout/lxsession-logout.c b/lxsession/lxsession-logout/lxsession-logout.c

index b0b817c..412244d 100644

--- a/lxsession/lxsession-logout/lxsession-logout.c

+++ b/lxsession/lxsession-logout/lxsession-logout.c

@@ -111,7 +111,10 @@ static gboolean verify_running(const char * display_manager, const char * execut

         /* Form the filespec of the pid file for the display manager. */

         char buffer[PATH_MAX];

-        sprintf(buffer, "/var/run/%s.pid", display_manager);

+        if (strcmp(display_manager, "kdm") != 0)

+            sprintf(buffer, "/var/run/%s.pid", display_manager);

+        else

+            sprintf(buffer, "/var/run/xdm.pid");

         /* Open the pid file. */

         int fd = open(buffer, O_RDONLY);