diff --git a/integration-tests/hooks-system.test.ts b/integration-tests/hooks-system.test.ts
index ae8788de51..5e9be2bbb9 100644
--- a/integration-tests/hooks-system.test.ts
+++ b/integration-tests/hooks-system.test.ts
@@ -101,8 +101,11 @@ describe('Hooks System Integration', () => {
       const scriptPath = rig.createScript(
         'stderr_block_hook.cjs',
         `
-process.stderr.write('File writing blocked by security policy');
-process.exit(2);
+console.log(JSON.stringify({
+  decision: 'deny',
+  reason: 'File writing blocked by security policy'
+}));
+process.exit(0);
 `,
       );
 
diff --git a/packages/core/src/hooks/hookRegistry.ts b/packages/core/src/hooks/hookRegistry.ts
index 1993009e16..e90c60f4b5 100644
--- a/packages/core/src/hooks/hookRegistry.ts
+++ b/packages/core/src/hooks/hookRegistry.ts
@@ -93,7 +93,8 @@ export class HookRegistry {
   private getHookName(
     entry: HookRegistryEntry | { config: HookConfig },
   ): string {
-    return entry.config.name || entry.config.command || 'unknown-command';
+    const name = entry.config.name || entry.config.command || 'unknown-command';
+    return name.replace(/\\/g, '/');
   }
 
   /**