diff --git a/lib/self-upgrade.bash b/lib/self-upgrade.bash
index 6f6f6ff..7829dbb 100755
--- a/lib/self-upgrade.bash
+++ b/lib/self-upgrade.bash
@@ -13,9 +13,10 @@ latest=$("$MIAOU_BASH_DIR/tools/wget_semver" artcode miaou/miaou-bash)
 
 if [[ "$current" == "$latest" ]]; then
   echo "up-to-date version: $current"
+  OLD_DIR="$MIAOU_BASH_DIR"
   export -n MIAOU_BASH_DIR
   unset MIAOU_BASH_DIR
-  source ../install.sh
+  source "$OLD_DIR/install.sh"
 else
   MIAOU_BASH_DIR='' source ../install.sh
 fi