diff --git a/zlogin b/zlogin
index ad432dc..a8951c9 100644
--- a/zlogin
+++ b/zlogin
@@ -15,7 +15,7 @@
 #uptime
 
 # If a network connection is available (check function def in zshrc)
-if ( is_network ); then
+if [( is_network )] && [ $(command -v cowsay) ]; then
   # Affiche un dessin (cf fonction définie dans zshrc)
   bonjour
 fi
diff --git a/zshrc b/zshrc
index c831c76..dd258c4 100644
--- a/zshrc
+++ b/zshrc
@@ -323,7 +323,7 @@ alias ccal='var=$(cal); echo "${var/$(date +%-d)/$(echo -e "\033[1;31m$(date +%-
 function bonjour() {
   MIN_TIME=$(date +%M)
   MODULO_MIN=$(($MIN_TIME % 2))
-  if [ $(command -v bash_quote) ]; then
+  if [ $(command -v bash_quote) ] && [ $(command -v cowsay) ]; then
     if [ $MODULO_MIN -eq 0 ]; then
       #echo Bonjour $USER, nous sommes le `date +"%A %e %B %Y"`, et il est : `date +"%H"` h `date +"%M"` | cowsay -f $(/bin/ls /usr/share/cowsay/cows -1 | head -n $(expr $$$(date +%s) % $(ls /usr/share/cowsay/cows | wc -w) + 1) | tail -n 1)
       command bash_quote | cowsay -f $(/bin/ls /usr/share/cowsay/cows -1 | head -n $(expr $$$(date +%s) % $(ls /usr/share/cowsay/cows | wc -w) + 1) | tail -n 1)