diff --git a/lib/rules/ensure-workspaces.js b/lib/rules/ensure-workspaces.js
index 7188e84..1f025ed 100644
--- a/lib/rules/ensure-workspaces.js
+++ b/lib/rules/ensure-workspaces.js
@@ -49,7 +49,10 @@ module.exports = {
             continue;
           }
 
-          let glob = path.join(node.value, 'package.json');
+          // fast-glob isn't handling windows paths
+          let _path = path.posix;
+
+          let glob = _path.join(node.value, 'package.json');
 
           let entries = fg.sync(glob, {
             cwd: path.dirname(filename)