diff --git a/__tests__/finder.test.ts b/__tests__/finder.test.ts
index 48ce454d..3ca2bd7b 100644
--- a/__tests__/finder.test.ts
+++ b/__tests__/finder.test.ts
@@ -24,6 +24,7 @@ const tempDir = path.join(
 );
 
 process.env['RUNNER_TOOLSDIRECTORY'] = toolDir;
+process.env['AGENT_TOOLSDIRECTORY'] = toolDir;
 process.env['RUNNER_TEMPDIRECTORY'] = tempDir;
 
 import * as finder from '../src/find-python';