diff --git a/codex-cli/bin/codex.js b/codex-cli/bin/codex.js
index 138796e5d6..6ec8069bd2 100644
--- a/codex-cli/bin/codex.js
+++ b/codex-cli/bin/codex.js
@@ -95,6 +95,14 @@ function detectPackageManager() {
     return "bun";
   }
 
+
+  if (
+    __dirname.includes(".bun/install/global") ||
+    __dirname.includes(".bun\\install\\global")
+  ) {
+    return "bun";
+  }
+
   return userAgent ? "npm" : null;
 }