diff --git a/packages/node_modules/@node-red/editor-client/src/js/ui/editors/code-editors/monaco.js b/packages/node_modules/@node-red/editor-client/src/js/ui/editors/code-editors/monaco.js
index f77405831..7aca0c6c9 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/ui/editors/code-editors/monaco.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/ui/editors/code-editors/monaco.js
@@ -719,6 +719,9 @@ RED.editor.codeEditor.monaco = (function() {
                 case "vue":
                     mode = "html";
                     break;
+                case "appcache":
+                    mode = "shell";
+                    break;
                 //TODO: add other compatability types.
             }
             return mode;