diff --git a/pxe/install-pxe.sh b/pxe/install-pxe.sh
index f20de40..df8a321 100755
--- a/pxe/install-pxe.sh
+++ b/pxe/install-pxe.sh
@@ -64,7 +64,7 @@ install_netboot() {
         if [ ! -d "${tftp_path}" ] || [ "${FORCE:-}" ]; then
                 mkdir -p "${tftp_path}/pxelinux.cfg"
                 cd "${tftp_path}"
-                if [ -f "${tftp_path}/netboot.tar.gz" ]; then
+                if [ ! -f "${tftp_path}/netboot.tar.gz" ]; then
                         wget http://ftp.debian.org/debian/dists/${VERSION_CODENAME}/main/installer-amd64/current/images/netboot/netboot.tar.gz
                         tar xvf netboot.tar.gz
                         rm -rf "${tftp_path}/pxelinux.cfg"