diff --git a/install.sh b/install.sh
index fc9bce9..614a34f 100755
--- a/install.sh
+++ b/install.sh
@@ -32,7 +32,7 @@ set -Eeuo pipefail
 ! assert_supported_distro && echo 'unsupported distro: debian-like OR arch-like expected' && exit 2
 
 export MIAOU_BASH_DIR
-if [[ -L /etc/inputrc && "$(readlink /etc/inputrc)" == "$MIAOU_BASH_DIR"/etc/inputrc ]]; then
+if [[ -d "$MIAOU_BASH_DIR" && -L /etc/inputrc && "$(readlink /etc/inputrc)" == "$MIAOU_BASH_DIR"/etc/inputrc ]]; then
   miaou-bash "$MIAOU_BASH_DIR/lib/self-upgrade.bash"
 else
   bootstrap