diff --git a/build/COPY_ROOT/opt/ai-dock/bin/preflight.d/.gitkeep b/build/COPY_ROOT/opt/ai-dock/bin/preflight.d/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/build/COPY_ROOT/opt/ai-dock/bin/preflight.sh b/build/COPY_ROOT/opt/ai-dock/bin/preflight.sh
deleted file mode 100755
index 7613d93..0000000
--- a/build/COPY_ROOT/opt/ai-dock/bin/preflight.sh
+++ /dev/null
@@ -1,13 +0,0 @@
-#!/bin/false
-
-# This file will be sourced in init.sh
-
-function preflight_main() {
-    preflight_do_something
-}
-
-function preflight_do_something() {
-    printf "Empty preflight.sh...\n"
-}
-
-preflight_main "$@"
\ No newline at end of file
diff --git a/build/COPY_ROOT/opt/ai-dock/bin/supervisor-jupyter.sh b/build/COPY_ROOT/opt/ai-dock/bin/supervisor-jupyter.sh
index fda5686..9ed4ce4 100755
--- a/build/COPY_ROOT/opt/ai-dock/bin/supervisor-jupyter.sh
+++ b/build/COPY_ROOT/opt/ai-dock/bin/supervisor-jupyter.sh
@@ -91,7 +91,7 @@ function start() {
             --ServerApp.allow_origin='*' \
             --ServerApp.allow_credentials=True \
             --ServerApp.root_dir=/ \
-            --ServerApp.preferred_dir=$WORKSPACE \
+            --ServerApp.preferred_dir="$WORKSPACE" \
             --ServerApp.terminado_settings="{'shell_command': ['bash','-c','bash']}" \
             --KernelSpecManager.ensure_native_kernel=False
 }