diff --git a/postinstall_partage.sh b/postinstall_partage.sh
index 3cc05f3a2d787909c719d8c806edbb09b476a0f6..e3d8f7094d91980d6b293ab18914ecadc33ad0bf 100755
--- a/postinstall_partage.sh
+++ b/postinstall_partage.sh
@@ -48,4 +48,9 @@ line="0 1 1 * * $DIR/registry/scripts/clean.sh > /dev/null 2>&1"
 (crontab -l; echo "${line}") | crontab -
 
 # Copy ssh key to tftp
+while [ ! -e "~/.ssh/id_rsa.pub" ]
+do
+    sleep 10
+done
+
 cp ~/.ssh/id_rsa.pub /var/lib/tftpboot/ltsp/id_rsa.pub