diff --git a/scripts/sandbox_command.js b/scripts/sandbox_command.js
index 774018a9..a7ae3c4c 100644
--- a/scripts/sandbox_command.js
+++ b/scripts/sandbox_command.js
@@ -48,7 +48,7 @@ if (!geminiSandbox) {
 
 if (!geminiSandbox) {
   let currentDir = process.cwd();
-  while (currentDir !== '/') {
+  while (true) {
     const geminiEnv = join(currentDir, '.gemini', '.env');
     const regularEnv = join(currentDir, '.env');
     if (existsSync(geminiEnv)) {
@@ -58,7 +58,11 @@ if (!geminiSandbox) {
       dotenv.config({ path: regularEnv, quiet: true });
       break;
     }
-    currentDir = dirname(currentDir);
+    const parentDir = dirname(currentDir);
+    if (parentDir === currentDir) {
+      break;
+    }
+    currentDir = parentDir;
   }
   geminiSandbox = process.env.GEMINI_SANDBOX;
 }