diff --git a/firewall/firewall-logrotate-script.sh b/firewall/firewall-logrotate-script.sh
index 9a2ac1f3..c437e948 100755
--- a/firewall/firewall-logrotate-script.sh
+++ b/firewall/firewall-logrotate-script.sh
@@ -11,7 +11,6 @@ if [[ `hostname` == 'komaz' ]]; then
 else
     exit 41
 fi
-
 logs_dst="/home/squid/`hostname`/logs"
 
 if [ ! -d "$logs_dst" ]; then
@@ -20,7 +19,7 @@ if [ ! -d "$logs_dst" ]; then
 fi
 
 # tant qu'il existe un fichier, le sauvegarder (<!>)
-while ( ls -tr "$logs_src" | grep -E 'logall\.log\.[0-9]+\..z2?' ); do
+while ( ls -tr "$logs_src" | grep -E -q 'logall\.log\.[0-9]+\..z2?' ); do
 dernier_fichier=$logs_src/$(ls -tr "$logs_src" | grep -E 'logall\.log\.[0-9]+\..z2?' | head -1)
 
 #timestamp=$(bzcat "$dernier_fichier" | head -1 | awk '{print $1}')