diff --git a/abra b/abra
index 6b412cb..d23f3e4 100755
--- a/abra
+++ b/abra
@@ -755,6 +755,10 @@ sub_app_new (){
     #   TYPE=custom-html, DOMAIN=foo.bar-baz.com
     #   -> custom_html_foo_bar_baz_com
     DEFAULT_NAME="${TYPE/-/_}_${DOMAIN//+([.-])/_}"
+    # truncate to 45 chars (see below)
+    DEFAULT_NAME="${DEFAULT_NAME:0:45}"
+    # and remove trailing _
+    DEFAULT_NAME="${DEFAULT_NAME%%_}"
     read -rp "App name [$DEFAULT_NAME]: " APP_NAME
     if [ -z "$APP_NAME" ]; then
       APP_NAME="$DEFAULT_NAME"