diff --git a/gestion/lock.py b/gestion/lock.py
index 569e86fd..baa360aa 100755
--- a/gestion/lock.py
+++ b/gestion/lock.py
@@ -77,13 +77,13 @@ def make_lock(lock_name, lock_comment='',nowait=1, quiet=False) :
 	fd.close()
 	    
 	# Informations sur le processus lockant
-	if os.system( "ps %s > /dev/null 2>&1" % pid ) :
+	if os.system( "ps ax | grep -q '^%s '" % pid ) :
 	    # Le script lockant ne tourne plus
 	    os.remove(lock_file)
 	elif nowait :
             if not quiet:
                 sys.stderr.write('Lock : %s\n' % lock_file)
-	    l=getoutput('ps -o etime --no-headers %s' % pid)
+	    l=getoutput("ps -ax -o pid,etime | awk '($1 == %s)'" % pid)
 	    data = [ user , pid , l.strip() ]
 	    
 	    # Formatate de etime