diff --git a/markdownlint-cli2.js b/markdownlint-cli2.js
index 6014767..8d01bd3 100755
--- a/markdownlint-cli2.js
+++ b/markdownlint-cli2.js
@@ -999,7 +999,7 @@ const main = async (params) => {
     const { text } = require("node:stream/consumers");
     nonFileContents = {
       ...nonFileContents,
-      "stdin": await text(process.stdin)
+      "./stdin": await text(process.stdin)
     };
   }
   // Include any file overrides or non-file content