diff --git a/packages/node_modules/@node-red/editor-api/lib/editor/theme.js b/packages/node_modules/@node-red/editor-api/lib/editor/theme.js
index 61c6e9a7e..12d5e3628 100644
--- a/packages/node_modules/@node-red/editor-api/lib/editor/theme.js
+++ b/packages/node_modules/@node-red/editor-api/lib/editor/theme.js
@@ -77,7 +77,7 @@ function serveFilesFromTheme(themeValue, themeApp, directory, baseDirectory) {
             let fullPath = array[i];
             if (baseDirectory) {
                 fullPath = path.resolve(baseDirectory,array[i]);
-                if (fullPath.indexOf(baseDirectory) !== 0) {
+                if (fullPath.indexOf(path.resolve(baseDirectory)) !== 0) {
                     continue;
                 }
             }