diff --git a/appveyor.yml b/appveyor.yml
index 11d008ca18..0b341ddceb 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -34,7 +34,7 @@ install:
               if %APPVEYOR_REPO_BRANCH EQU master
                 (cd scripts && sh start.sh -t -ss || exit 1)
               else
-                (cd scripts && sh start.sh -d -t -ss -gitjsapi development|| exit 1)
+                (cd scripts && sh start.sh -dev -t -ss -gitjsapi development|| exit 1)
     )
 
 # Don't actually build.
diff --git a/scripts/npm-clean.sh b/scripts/npm-clean.sh
index 94327ba20a..0ac53409cc 100755
--- a/scripts/npm-clean.sh
+++ b/scripts/npm-clean.sh
@@ -36,7 +36,7 @@ while [[ $1  == -* ]]; do
     case "$1" in
       -h|--help|-\?) show_help; exit 0;;
       -sd|--skipDemo) update; shift;;
-      -*) shift;;
+      -*) echo "invalid option: $1" 1>&2; show_help; exit 0;;
     esac
 done
 
diff --git a/scripts/start.sh b/scripts/start.sh
index c7822d4e49..b8ac0537fe 100755
--- a/scripts/start.sh
+++ b/scripts/start.sh
@@ -135,7 +135,7 @@ while [[ $1  == -* ]]; do
       -dist)  enable_dist; shift;;
       -gitjsapi)  enable_js_api_git_link $2; shift 2;;
       -vjsapi)  version_js_api $2; shift 2;;
-      -*) shift;;
+      -*) echo "invalid option: $1" 1>&2; show_help; exit 0;;
     esac
 done