diff --git a/src/config.ts b/src/config.ts
index f3983f9..6364e77 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -46,6 +46,10 @@ function replacement(name: string): string|undefined {
       return path.dirname(vscode.window.activeTextEditor.document.uri.fsPath);
     return process.cwd();
   }
+  if (name === 'workspaceFolderBasename' &&
+      vscode.workspace.rootPath !== undefined) {
+    return path.basename(vscode.workspace.rootPath);
+  }
   const envPrefix = 'env:';
   if (name.startsWith(envPrefix))
     return process.env[name.substr(envPrefix.length)] ?? '';