diff --git a/src/plugin-sdk/command-status.runtime.test.ts b/src/plugin-sdk/command-status.runtime.test.ts
index 480f86d7d7f..5f104e02235 100644
--- a/src/plugin-sdk/command-status.runtime.test.ts
+++ b/src/plugin-sdk/command-status.runtime.test.ts
@@ -45,7 +45,7 @@ function expectResolvedReasoningLevel(value: unknown, expected: string) {
 }
 
 function requireBuildStatusReplyParams(index = 0): unknown {
-  const call = buildStatusReply.mock.calls.at(index);
+  const call = buildStatusReply.mock.calls[index];
   if (!call) {
     throw new Error(`expected buildStatusReply call ${index}`);
   }