diff --git a/cli/src/agent/backends/acp/AcpStdioTransport.ts b/cli/src/agent/backends/acp/AcpStdioTransport.ts
index b2178b95..e8f83873 100644
--- a/cli/src/agent/backends/acp/AcpStdioTransport.ts
+++ b/cli/src/agent/backends/acp/AcpStdioTransport.ts
@@ -47,7 +47,8 @@ export class AcpStdioTransport {
     }) {
         this.process = spawn(options.command, options.args ?? [], {
             env: options.env,
-            stdio: ['pipe', 'pipe', 'pipe']
+            stdio: ['pipe', 'pipe', 'pipe'],
+            shell: process.platform === 'win32'
         });
 
         this.process.stdout.setEncoding('utf8');