diff --git a/packages/core/src/services/shellExecutionService.test.ts b/packages/core/src/services/shellExecutionService.test.ts
index 2fe51a5e984..9c887799b20 100644
--- a/packages/core/src/services/shellExecutionService.test.ts
+++ b/packages/core/src/services/shellExecutionService.test.ts
@@ -49,9 +49,8 @@ describe('ShellExecutionService', () => {
 
     mockChildProcess = new EventEmitter() as EventEmitter &
       Partial<ChildProcess>;
-    // FIX: Cast simple EventEmitters to the expected stream type.
-    mockChildProcess.stdout = new EventEmitter() as Readable;
-    mockChildProcess.stderr = new EventEmitter() as Readable;
+    mockChildProcess.stdout = new EventEmitter() as unknown as Readable;
+    mockChildProcess.stderr = new EventEmitter() as unknown as Readable;
     mockChildProcess.kill = vi.fn();
 
     // FIX: Use Object.defineProperty to set the readonly 'pid' property.