diff --git a/lib/self-upgrade.bash b/lib/self-upgrade.bash
index ad0bdc9..a9d857d 100644
--- a/lib/self-upgrade.bash
+++ b/lib/self-upgrade.bash
@@ -18,13 +18,22 @@ function self_upgrade {
   fi
 }
 
+function repair_miaou_bash_dir {
+  if [[ -v MIAOU_BASH_DIR ]]; then
+    >&2 echo 'WARNING: MIAOU_BASH_DIR undefined : repair-mode enabled'
+    MIAOU_BASH_DIR=/opt/miaou-bash
+    export MIAOU_BASH_DIR
+  fi
+}
+
 # MAIN
 
+repair_miaou_bash_dir
 source "$MIAOU_BASH_DIR"/lib/functions.bash
 assert_system_mode
 assert_root
 
-current=$("$MIAOU_BASH_DIR"/bin/miaou-bash --version)
+current=$(miaou-bash --version)
 latest=$("$MIAOU_BASH_DIR/tools/wget_semver" artcode miaou/miaou-bash)
 if [[ "$current" == "$latest" ]]; then
   . "$MIAOU_BASH_DIR"/bin/miaou-bash --initiate