diff --git a/test/cli/test/claudecode-flag.test.ts b/test/cli/test/claudecode-flag.test.ts
index 17c36ea9aa..80c082e6f9 100644
--- a/test/cli/test/claudecode-flag.test.ts
+++ b/test/cli/test/claudecode-flag.test.ts
@@ -6,7 +6,7 @@ let testEnv: NodeJS.Dict<string>;
 
 beforeAll(() => {
   testEnv = { ...bunEnv };
-  delete testEnv.AGENTS;
+  delete testEnv.AGENT;
 });
 
 test("CLAUDECODE=1 shows quiet test output (only failures)", async () => {