diff --git a/lib/index.js b/lib/index.js
index 562bafb..2ecd39d 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -94,7 +94,7 @@ function run() {
         core.setOutput('items', items);
         core.setOutput('newlines', fnewLines);
         core.setOutput('result', fresult);
-        core.setOutput('changed', markdown_1.isChanged(lines, result));
+        core.setOutput('changed', markdown_1.isChanged(lines, result) ? '1' : '0');
         core.info('Done!');
     });
 }